Use the form subdivision ‡v Maps under topical headings for individual maps or collections of maps on those subjects. For example: ‡a Railroads ‡z [Geographic name] ‡v Maps. It’s also possible to use ‡v Maps under individual corporate bodies in 610.
For cadastral maps, relevant headings may include 650 _0 ‡a Real property ‡z [geographic area] ‡v Maps or 650 _0 ‡a Real estate development ‡z [geographic area] ‡v Maps.
Include one or more 651s ‡a [country, region, municipality, etc.] ‡v Maps to represent the total area of coverage of the map.
Include at minimum ‡a Manuscript maps. ‡2 lcgft
When possible, also include a more specific Library of Congress Genre/Form Term. Consult the Cartographic Materials 655 Form/Genre Headings list maintained by Cataloging @ Yale (https://web.library.yale.edu/cataloging/cartographic/655 [1]).