Y1 TOPOGRAPHY BY ERA (PROTOTYPICAL)
Y2 IDEAL CITIES
Y3 PREHISTORIC
Y4 ANCIENT
Y5 TO PRESENT DAY
Y6 WORLD MAPS
Y7 NATURAL LANDSCAPES

Y1. TOPOGRAPHY BY ERA (PROTOTYPICAL)
This classification is used for hypothetical or unidentifiable sites not (necessarily) relating to a particular locale. It includes prototypical examples of cities and city parts.

Y1.1 General
Y1.2. Comparisons
Y1.3. Ancient
Y1.4. Medieval & Islamic
Y1.5. Renaissance
Y1.6. Baroque/17th & 18th centuries
Y1.7. Colonial
Y1.8. 19th century
Y1.9. 20th century

Second lines usually correspond to 3rd lines for other topography Sections, e.g., there are no third lines. Occasionally, when example is both prototypical and particular to a country, the 2nd line will be country number (see Table II), and the 3rd line will be usual topographical number (see Table VI). For example:

Y1.4                    MEDIEVAL. 
53                       Dutch.
11-1                    Plan, Dike town.

Y1.9                    20TH C. 
51-6                    Street traffic & road sections.

Y2. IDEAL CITIES
This classification is used for utopian cities, and cities of the future. Imagined views of places in the future may also be classified in other places: under Period-General Section-Unbuilt Projects or Painting; if drawn by an architect, filed with the architect's work.

The second line of call number includes: the 1st letter of designer's name, plus Cutter number for that name. The first element of the label is the designer's surname, shown in all caps. Occasionally place names are used instead of designer name.

The third line of the call numbers in this section include the first two or three 2-3 letters of the designed city name, followed by regular topography third lines (Table VI)

Y2 
F478                    FILARETE, Antonio.
Sf11.1464-1         Sforzinda. Plan, 1457-1464.

Y3. PREHISTORIC TOPOGRAPHY
This classification has been used for Stone, Bronze and Iron Age places, and includes mounds and ancient earthworks. Places with a continuous history, such as Rome, may be classified in the General Topography section to keep one place filed together rather than here.


Y4. ANCIENT TOPOGRAPHY
The subheadings below usually refer to historical, not geographical divisions. All Roman towns, for example, regardless of location, whether in Britain, Italy, etc., go under Roman. Note that there is no subdivision for Ancient Meso-American, as maps and plans of Meso-American sites have been classified with the Js, The Americas. ASL recommends that collections considering using these schema add Meso-American or Pre-Columbian to Y4)

Y4.1. Egyptian
Y4.2. Near Eastern
Y4.3. Far Eastern (everything east of Afghanistan)
Y4.4. Aegean
Y4.5. Greek
Y4.6. Roman
Y4.7. Africa

The second line of the call number includes the first letter of city or place, followed by its Cutter number. The third line of the call number is taken from Table 6.

Y4.2                    ASSUR
A951                   Map. Assyrian, Neo-Assur,
11-2                    Parthian periods. Beek's Atlas, pl. 20 

Y5. GENERAL TOPOGRAPHY, TO PRESENT DAY (Formerly Medieval to Modern)
This classification was originally limited to slides of places from the Early Christian period, circa 560 C.E. (Common Era) to the present day. In practice, however, we often find it more appropriate to include older images so that all images from one place file together. For example, maps of Rome logically should all be found together under Y5. Patrons are advised to use both Y4 and Y5 for materials pre-dating the Early Christian era. 

This section of the Y classification comprises the major topographic collection. This section is arranged alphabetically by country according to Table 2, then by place name. The second line of the call number contains the Country number from Table 2, followed by the first letter of the place name & Cutter number for that name. See Table 6 for a description of the third lines of the classification number.

Y5                     TOMBOUCTOU
3.9T656             Plan, 1896, with environs.
11.1896-1          Hull, p. 101. 91-237-010

Note: Slides in which the particular locale is not a critical component of the image may be filed with other slides germane to that county, rather than by the particular locale. These slides are filed at the beginning of the country, before the first locale. Their call numbers are constructed with a short second line that shows only a country number from Table 2. Third lines come from Table 6.

Y5                     Italy
44                     Map, 1918
11.1918-1          Smith, pl 9.

Y6. WORLD AND REGIONAL MAPS
Maps of individual countries, cities, states and places within countries are filed under General Topography, Y5. The Y6 section is used for areas larger than individual countries, such as continents, hemispheres, trade routes, etc. This section is also used for areas with substantially changed boundaries. Begin label description with MAP in all capitals. The Y6 classification does not generally require a third lines from Table 6.

SUMMARY OF WORLD AND REGIONAL MAPS COLLECTION:

Y6.0 Prehistoric maps
Y6.1 Ancient maps
Y6.2 Medieval Europe
Y6.3 Byzantine
Y6.4 Islamic
Y6.5 Modern

6.0.Prehistoric maps 
6.1.Ancient World. 
If not of the entire known world, then subdivide:

SECOND LINES                                THIRD LINES

A. Egypt                                        Date(s), if known
B. Near East
C. Far East
D. Aegean
E. Greek
F. Roman & Etruscan
G. European
H. Americas

A. North America
B. MesoAmerica
C. South America

tY6.1                    MAP. North
H                          America, 1622 
A.1622-1               Beek's Atlas, p. xx.

6.2 Medieval Europe. 
If not of whole area, subdivide by adding letter of general area, then year, if known.

Y6.2I                    MAP.
1104                     Italy, 1104

6.3. Byzantine
6.4. Islamic
6.5. Modern whole world. 
Subdivide areas as follows:

SECOND LINES                               THIRD LINES

A. Eastern Hemisphere                  Date(s), if known
B. Western Hemisphere
C. Europe
D. Asia
E. Africa
F. North America
G. Central & South America
H. Australia, New Zealand, Oceania

Y6.5                      WORLD MAP, 1648.
1648-1                   Blaeu engraving.
                             Merian. 88-141-001/

Y7. NATURAL LANDSCAPES
Use this classification for large scale landscapes, not single trees or flowers, unless as a part or detail of a larger landscape area like Yosemite, Sierra Nevada, etc. Includes formation diagrams. Do not use Table 6 for third lines: see below.

Second lines:
Solar System. Use #1, then 1st letter of planet name, and Cutter, number for that name.
1E12 = Earth

Country number (Table 2) followed by first letter of place name and Cutter number for that name

National Parks in the U.S. are filed under their own names. Other miscellaneous views should be filed under the state, not the nearest city.

Outside the U.S., if the lake or mountain range is not known, use only the country number

Third lines: 
Use the following table, followed by the first two or three letters of the subject. El Capitan (already designated Yosemite by the 2nd line) would be 2.1Elc. This is not a perfect system. Water bodies are particularly bothersome as a river might begin at lake, become a waterfall. This classification has not been used enough in our collection to revise it.

Note: View types in our database uses at 10 at beginning of third line. The (10) does not appear on the call number. In the database, search for 101, 102, etc.

(10)1. Water bodies (take precedence over land bodies)
1.1. Ocean or sea, e.g., (10)1.1
1.2. Lake
1.3. River
1.4. Waterfall
1.5. Strait
1.6. Fjord

(10)2. Land bodies
2.1. Mountain, mountainous areas
2.2. Arid and desert areas
2.3. Farmland
2.4. Coastline
2.5. Islands
2.6. Tundra
2.7.Subterranean

(10)3. Details within a place
3.1. Living things
3.2. Non-living things
3.3. Minerals or gases

slides/Classification/Table 5. revised July 2000