Frey, Donnalyn. A directory of electronic mail addressing and networks / Donnalyn Frey and Rick Adams. - 2nd rev. ed. - Sabastopol, Calif. : O'Reilly & Associates, 1990. - xvi, 420 p. - UNIX communications . ISBN: 0937175153 LCCN: 92026225 Subjects--Topical Terms: Electronic mail systems.