Standard call number: G4263.xxP2 yyyy |b .W9z
Where:
xx is the county cutter
yyyy is the date of situation
z is the cutter for the size of map:
.W92 for small (22 x 38 cm),
.W94 for standard (46 x 76 cm),
.W96 for enlarged (92 x 153 cm)
Editions that do not conform to these sizes are given the .W4 or .W6 cutter, depending on the drawer size needed to house them (Hebard Map gets .W4, Hebard Map Folio and Hebard Map Port get .W6).
Dates: Dating these sets is difficult. Maps sometimes use two different dates, the date of situation (the date of the information on the map) and the publication date. The date of situation is used in the call number, and the publication date is used in the 264 and the Dates fixed field.
Most of the highway map sets have a date near the title (usually bolded) and an approval date in small type near the bottom margin. In this case, the bold date is the date of situation and the approval date is the publication date. We have to assume that the map data was created at the time of the bolded date (date of situation), and not changed when it was approved (publication date).
If the sheets in a set have a revision date, and it’s the same for all the maps, use that date as the date of situation and the publication date.
If the sheets in a set have different revision dates, use the range of dates as the publication dates (DtSt m), add a note saying “Some sheets revised to xxxx and yyyy” giving the revision years from each of the revised sheets, and use the bolded date as the date of situation, since that is the only consistent date among the sheets in this case.
Sheet numbering: Use actual sheet numbers as volume numbers in the item record: e.g. Sheet 7-3.
Ancillary maps: Most sets have a key map and a key to the sheets in the set. Many sets have ancillary maps for towns in the county. Check all the sheets for ancillary maps; an ancillary map for a town is on the sheet for the area of the county where the town is located. (For example, the map of Lander is on sheet 7-3, and the map of Riverton is on sheet 7-4 in the Fremont County set.)
Subject headings are:
650 0 Roads |z Wyoming |z [county] |v Maps.
655 7 Road maps. |2 lcgft