Some Internet locations to check:

ftp.wustl.edu       Big archive
www.amsat.org
www.arrl.org
www.sp.nps.navy.mil
ftp.sel.noaa.gov
www.cdrom.com
www.archive.umich.edu
ftp.w6yx.stanford.edu
ftp.usask.ca

Hints: on finding useful sites
       try gopher subject
       try www or ftp, followed by company/organization name,
        followed by domain name, comm, edu, etc
       keep your own list