The Topdrawings series specializes in line-drawings of a given subject in each booklet. The 120th installment in this series is devoted to the always popular Armored Personnel Carrier Half-Track. This booklet covers the M3/M5/M9 versions of the half-track which were manufactured by International Harvester Company.
This booklet has 5-View line drawings for the M3A1, M3A2, M5, M5A1, M5A2, M9A1 in 1/35, 1/48 and 1/72 scale plus color profiles of M5, M9, M9A1 in French, Polish and American Service during World War II.
The booklet also includes a brief description on the overall history of the AFV. Sadly, not all line drawings have an explanation as to what was modified from the previous block series. By my personal inspection of the drawings the main differences are around the fenders and the back of the crew compartment (rounded edges instead of square ones). There might be other differences I have not noticed.