"Superman's Greatest Feats" actually appears in that month's Superman #146.
Inside front cover.
Inker credit confirmed by Pat Lang. Inker credit previously given to George Klein (as per Gene Reed) or Stan Kaye.
Job number appears on original printing but not on this printing.
Includes letters from Douglas Dowdy, Jimmy Longgardner, Steven Sussman, Viola M. Schrader, Joseph Blitman, Leon Wieseltier, MIke Hyatt, Darla Middbrook.