If the titles you need aren't in these catalogs, find other libraries that hold them -- WorldCat combines the catalogs of many (but not all) libraries.
When in doubt, search a library's own catalog, which is usually available on its web site. Inquire about the U.S. Department of the Interior Library's Interlibrary Loan service and save yourself a trip.
Search for an item in libraries near you:Enter title, subject or person
U.S. Department of the Interior
The Interior Library
library@nbc.gov
Last Updated on 12/23/08