<1973>: "Includes 22 westernmost states in the United States of America".
<1975>: "Includes 22 westernmost states in the United States of America and all of Canada and Mexico."
Edited by: <1973->, Bill Rand, and: Bo Siewert.
Compiled by: <1975->, Bill Rand, Tyke Brown, Bob Doggett.
Description based on: '73; title from title page.
Latest issue consulted: '75.