This is a book or magazine about tanks/AFVs and/or military modeling.
From the Ampersand website:
The Germans developed and used the motorcycle as an instrument of offensive warfare, perhaps more than any other nation in WWII. The major tasks of these units were mopping-up for the following troops and employment as an advance guard, surprise raid-like attacks against an opponent’s flanks and rear, as well as pursuit of the opponent. A wide variety of machines were deployed for these tasks, both impressed and adapted civilian models, as well as variety of purpose-built military motorcycles. This distinctive reference combines rare vintage photographs with photos of superbly restored German WWII motorcycles. The first of a multi-part series on the subject, this volume features large, full-color detail photos of the BMW R4; R12; R35; R71; R74 and Zündapp KS750. Only the very finest examples of these motorcycles were sought out for inclusion in this title.