Black Cat Books
NOTE: Titles originally just said “A Black Cat Book” at top of front cover with no series number. At some point they changed to “An Evergreen Black Cat Book” with a Bx- number.
Prefixes:
BA = $.50
BB = $.60
BC = $.75
BD = $.95
BC-60 is the first to use the “An Evergreen Black Cat Book” edition statement and the first to drop the practice of tying the prefixes to price. So BC-60 was $1.45, BC-61 was $.95, etc.
Additional Information
https://www.jahsonic.com/GroveBibliography.html -- lists BC 1-566
Grove Press Starts Mass Market Line, PW, June 19, 1961, at 44.
Italicized note, PW, Mar. 9, 1964, at 65 (announcing that Henry Miller's Black Spring, due out April 15, 1964, and Bertolt Brecht's Early Plays will launch a "new series by Grove Press, the Evergreen-Black Cat Books, which combine Grove's two paperback lines. The series will be printed in a standard size (4-3/16 x 7-1/16 in.) and fit mass-market paperback racks. They will sell at a low price.")