Analog SF&F Magazine Audio Books / Cassettes?

I'm trying to find back copies of Analog SF&F Magazine Or Asimov's science fiction on four track cassette, 8 rpm disc or in any audiobook format. Any ideas where I might have luck in locating them?

Library of Congress doesn't have them. Most Libraries don't keep them either.

It's been recorded on 8 rpm disc and on 4 track cassette for the use of the blind and the physically handicapped. All of this is also true for Asimov's stuff. Any help in locating these would be greatly appreceated.

Check with the corp who recorded them for the blind and physically handicapped...they got them from somewhere.