Answer: Out-of-print USGS publications and maps, depending on
series and date, can usually be obtained in either of two ways:
1. Check with your local public, academic, or
corporate librarian to request an interlibrary loan from either a
regional government depository library or from your nearest USGS
Library.
2. Purchase copies through the services of a document
delivery company. Several of these are listed on the Web at:
http://www.docdel.com/Geology_and_Earth_Sciences.html
Selected USGS publications, especially those that are old,
popular, or rare, may also be available from used book dealers. Lists and
searchable databases of used books are available at several sources on the
Web.
| 
