First published in 1994, the book Firewalls and Internet Security: Repelling the Wily Hacker by William R. Cheswick and Steve Bellovin helped define the concept of a network firewall.
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Firewalls and Internet Security: Repelling the Wily Hacker ISBN 0-201-63357-4 (with W. Cheswick) - one of the first books on internet security.