The Michael Aaron Piano Course Lesson books have been completely re-engraved, expanded (adding more definitions of musical terms and more musical pieces), updated (with modernized artwork), and re-edited (with less emphasis on fingerings and more on note-reading).
Primer. Composed by Michael Aaron. Piano method/supplement. Michael Aaron Piano Course. Book. 48 pages. Belwin Music #00-11008A. Published by Belwin Music (AP.11008A).