An official website of the United States government.
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure websites use HTTPS
A small lock or https:// means you’ve safely connected to a .gov website. Share sensitive information only on official, secure websites.
This searchable photo gallery is a useful tool for hard-to-classify items. If you find an item that you don’t know how to record, search for a material type in the 'Search Photos' box below. For general categories, select one of the links below.
A printable field version of the photo gallery is also available.