11. Plans and maps, undated, then chronologically
12. Aerial views, undated, then chronologically. Includes bird's eye views. Includes bird's eye views.
13. Views, undated, then chronologically

21-29 Parts of Cities: Alphabetically organized

21. Plans and maps
22. Aerial views
23. Views
24. Details 
25. Miscellaneous, including unbuilt proposals

31-39 Residential buildings and areas

31. Individual houses, small apartment buildings
32. Mass housing
33. Temporary housing; squatters

41-49 Non-residental Buildings and Areas

41. Commercial
42. Industrial
43. Agricultural
44. Waterfront
45. Defense, walls. 
46. Miscellaneous
47. Unknown

51-59 Transportation

51. Automotive
52. Mass Transit
53. Railroads
54. Air
55. Water
56. Miscellaneous, including pedestrian, bridges, animals, etc.

61-69 Community Structures and Services

61. Governing bodies
62. Education
63. Recreation
64. Cultural
65. Religious, including cemeteries
66. Safety (defense use 45)
67. Health and Welfare
68. Public Utilities

71-79 Miscellaneous Details

71. Monuments
72. Street Furniture
73. Boundaries and Borders; Decorative Elements
74. Textures/Materials
75. Signs
76. Landscape
77. Miscellaneous Details

81-89 Land Trusts

81. Indian Reservations

91-99 Life, Times and Inhabitants, Chronological

91. Political Events
92. Festivals
93. Projects, construction views, unbuilt works, etc.
94. Destruction of the City, disasters if architect not known
95. Ethnographic
96. Miscellaneous, includes building regulations, land use diagrams
97. Religious events other than festivals

TOPOGRAPHY ARRANGEMENT:
2nd Lines:

Country Number (Table 2)
Then, 1st letter of place name 
Then, Cutter number for that name

Example: 80S195 = USA. San Francisco

A country number with no place letter and no Cutter number is used for the country as a whole, and files before material with Cutter numbers

3rd Lines:
Subject of slide. Use the following table.
Two types of 3rd lines:

Number, ,date, series number
Example: 11-1 or 11.1953-1
Letter, view type number, series number
Example: Ri22-1

Letters on the 3rd lines are used for slides in the 20's series. The letters precede the numbers. These slides file after the 10s (11's, 12's and 13's series), and before the 30's series. 3rd line letters may also be used for slides in other series, after the numbers, in order to further subdivide the series. Example: 64L-1 = Library; 1st slide in sequence

CHRONOLOGY
Years: a small s denotes a general period of time, year, decade or century.
Dates with a small s file before the same date without the s. Time spans: if a map or plan spans a period of time, generally use the latest date.

1800s
1800
1801
Map 1165-1865: use 1865

DETAILED ARRANGEMENT:

11-19 Whole Cities, Towns

(Include new towns that have their own administration; make
cross-references from large nearby cities)

11. Plans, maps. Arrange chronologically. Plans, maps, models of
towns. Undated plans file first.
          11-1                   undated map
          11.1470-1                   map dated 1470, first one catalogued
          11.1470-2                   map dated 1470, second one catalogued
12. Aerial views. Arrange chronologically; undated views file first.
13. Views. Arrange chronologically; undated views file first.
Includes photographic and pictorial views and vedutas. 
Also includes views larger than a part but smaller than the 
whole city. Includes bird's eye views.

21-29 Parts of Cities: Alphabetical

3rd lines: 3-4 letters of area name, followed by view number, 
then a hyphen and series or sequence number. Prefer this section over sections 3--, 4--, 5--, 6--
      Ba21-1
      Ba22-1
      Ba23-1
      Ba23-2

Label description, 1st and 2nd elements:
City name, in caps. Area or neighborhood name, 1st letter cap.
Area name must correspond with letter designation in 3rd line
of call number

FLORENCE. Duomo.               tY5
Street scene,                        44F632
near Duomo.                         Du23-1

21. Plans, maps, including squares, piazzas, neighborhoods, districts, etc. Includes models, sections, elevations.
22. Aerial views of parts. 
23. Views of parts. Includes pictorial representations, views down long avenues, bird’s eye views. Some standardized alphabetical designations

Do                        downtown
Mo                       monumental axes (Brasilia, Paris, Washington, D.C.)
Pi               piazzas.
                           Pina Piazza Navonna
Pl               plazas, places
                           Plco Place de la Concorde
Ru              rue (French only - do not continue)
                           Ruri Rue de Rivoli
St or Str               streets
                           StBr Broadway (Street, Broadway)
Vi               viae (Italian only - do not continue)

When possible, keep old sections and their corresponding redevelopments together, such as Yerba Buena in San Francisco, or Beauborg in Paris. If impossible, cross-reference.

24. Details of Parts
ROME.Campidoglio.                           tY5
Marcus Aurelius Statue.                     44R763
                                                        Ca24m-1

ROME.Campidoglio.Surface                tY5
                                                        44R763
                                                        Ca24s-1(1st slide in series) 
25. Miscellaneous, including unbuilt proposals. 
Use sparingly, when 21-24 do not apply, and material must be kept under neighborhood. Example: San Francisco. South of Market proposals.

31-39 Residential Buildings and Areas
Give preference to parts of cities, 20s-- series. Use 30s-- when slide does not fit into historical section, or belong to a known, named part of city. If house is typical of a period, but not a country or city, use historical, general, prototypical (+B4).

31. Housing.
Individual housing and small apartment buildings up to 30 units (unless part of a tract or mass housing project), or for buildings 3-4 or fewer stories.
32. Mass housing. 
Large apartments (30+ units), tracts, subdivisions, developments. Miliatary housing may be classified under 66, with cross-references. Redevelopment housing projects may go here, unless more appropriate to 20s-- series.
33. Temporary housing. 
Temporary sites and/or materials, including camps, mobile homes, vans, cars, migrant housing, squatters, homeless people.

41-49 Non-Residential Buildings and Land Use Patterns
Does not include residential land use, such a tracts, condominiums, redevelopments, which go under 3-- series.

41. Commercial. Includes restaurants, stores, chain stores, shopping centers, malls, hotels, brothels, when not by a known architect, and when not part of a named neighborhood, or when the intent of the slide is to show commercial establishments by city (but not by neighborhood) rather than by architect.
42. Industrial. Includes warehouses, factories, plants, districts, industrial parks.
43. Agricultural.
43b = barns 
43e = grain elevators
43fa = farms
43fi = fields
44. Marine or waterfront.
45. Reserved for expansion. Formerly used for defense, walls, prefer 66.
46. Miscellaneous. Standard subdivisions are:
46t Towers
46o Obelisks
48. Reserved for expansion. Formerly used for utilities, prefer 68.

51-59 Transportation 

51. Automotive. Including streets, pre-automotive, tunnels, freeways, gas stations, parking lots, garages, traffic furniture, etc., when descriptive of city. Bridges may also go here, when not appropriate for historical general (+B2) or historical section proper (as when by known architect, such as Maillart). Standardized subdivisions may be developed as needed.

52. Mass Transit and Facilities. Bus, rapid transit, light rail, urban trains, etc.
53. Railroads, mainly inter-city and country.
54. Air Transit. Airports, heliports, etc.
55. Water Transit. Ferries, hydrofoils, ports, etc.
56. Miscellaneous Circulation. Pedestrian malls, bike routes (unless more properly under street or neighborhood), etc.

61-69 Community Facilities and Services

61. Governing Bodies. City centers, city halls, city, county, state and federal service centers.
62. Education. Elementary, secondary and college or university buildings.
64. Cultural. Art galleries, theaters, concert halls, libraries, zoos.
65. Religious. Churches, cemeteries, mausolea, etc.
66. Safety and Defense. Military bases, forts, housing, police, fortifications, city walls, shelters, etc.
67. Health and Welfare. Hospitals, prisons, institutions.
68. Public Utilities and Energy. Water supply and flood control, waste disposal (sewers, sewage treatment plants, dumps), communications (telephone, radio, television), energy generation and storage (electrical, geothermal, solar, wind, water, gas, oil).

71-79 Miscellaneous Elements
When not an integral part of an identifiable neighborhood or part of the city, and when not historical general, but particular to the city.

71. Monuments, fountains, sculpture
72. Street furniture, lights, benches
73. Boundaries, walls, gates, fences, borders
74. Textures, paving, surfaces, ornamentation
75. Signs and symbols, billboards, neon
76. Landscaping

81-89 Land Trusts

81. Indian Reservations

91-99 Life, times and inhabitants. Chronological whenever possible
Subdivisions depending on each city's history should be recorded.

91. Political Events and Newsmakers, political parades. Arrange chronologically, as in 10s-
92. Festivals. Religious, historical, any of a celebratory nature.
93. Projects. Constructions. If particular to a neighborhood, use 25.
93a Archaeology
94. Destruction. Earthquakes, hurricanes, war. Slum clearance andredevelopment before new buildings go up are more appropriate under the name of the neighborhood.
95. Ethnographic. People, their dress, faces, pets, activities, etc.
96. Miscellaneous. Building regulations
97. Religious Events, but not festivals. Prefer 91, 92.

Paris                               Rome                                 All Cities
91+year     revolution       91f     fascism                    95c Cafes, cafe life
91n           Napoleon         91m   Mussolini himself      95L Labor
                                       91p    Pope himself
                                       92a    athletics
                                       92s    spectacles