The official PGP user's guide:
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Bibliographic Details
Main Author: Zimmermann, Philip R. (Author)
Format: Book
Language:English
Published: Cambridge, Mass. [u.a.] MIT Press 1995
Edition:2. print.
Subjects:
PGP
Physical Description:XVIII, 126 S.
ISBN:0262740176

There is no print copy available.

Interlibrary loan Place Request Caution: Not in THWS collection!