Billboard  Buyer's Guide 1970-71  Apple Records  May 1969 - May 1970 (pages 9-26)    ★ [Magazine] Cash Box (July 4, 1970)   ★ [Magazine] Billboard Buyer's Guide 1969-70 (Aug 30, 1969)  ★ [Magazine] Billboard Buyer's Guide 1971-72 (Sep 1