This subject index presents the categories assigned in the 1940s to make it possible to browse the FSA/OWI photographs by what they depict. The agency used a decimal number classification scheme. This section of the subject index presents the categories by their classification numbers. The classification numbers retrieve photos that are filed under the classification number in the FSA/OWI file of photographic prints. An alphabetical listing of the words associated with the classification numbers is also available.

• The categories and the words used to describe them are products of their era and have not been altered for this presentation.
• Not all numbers retrieve descriptions and images, either because the information has not yet been added to the description, or because the originating agency never applied the number to any photographs.
• For more information, view the introduction to this list.