M4 Sherman M4, M4a1, M4a4 Firefly

This book contains fairly nice scale drawings of only five tanks (none of the ones listed in the book description on this Amazon listing), but four of the tanks are almost identical to each other, differing in only the smallest of details. Even though this is an incredibly small book (only 18? pages), how is it possible that it includes drawings for only 5 tanks? Because the drawings are repeated over and over in multiple scales (1/72, 1/48, 1/35, 1/16). Last I checked, most modelers are perfectly capable of wielding a ruler and calculator. It would have been much better to include drawings of far more tanks printed in only a single scale, leaving it to the model builder to convert scales, if needed. There are several captioning mistakes as well. The color profiles are nice (only one of which is of a tank included in the drawings), but they do not make this VERY thin book worth its price.