In addition to the card catalogue, which describes collections in detail, see Paul Vanderbilt, Guide to the Special Collections of Prints and Photographs in the Library of Congress (Washington, 1955), used extensively in writing this entry.
Note: The following collections, cited in Vanderbilt (see below), have been lost, dispersed, or become part of other collections: Alexander II Collection, Bristol Collection, William Eleroy Curtis Collection, Kun Collection, Kalugin Collection, Noyes Collection.