National Technical Information Services (NTIS)
5285 Port Royal Road
Springfield, VA 22161
phone (703) 487-4600
http://www.ntis.gov/index.asp

NASA Technical Reports Server, http://ntrs.nasa.gov/

NASA Center for AeroSpace Information (CASI)
7121 Standard Drive
Hanover, MD 21076-1320
Phone (301) 621-0390
http://www.sti.nasa.gov/STI-public-homepage.html

US citizens may obtain a CD containing the first 34 proceedings from NASA.

http://www.grc.nasa.gov/WWW/spacemech/CD-info.html
The proceedings are included on the Space Mechanisms Handbook and Reference Guide CD ROM