49cm 'Big Bertha' and German Siege Artillery of WWI

Despite its short length, the book deals very satisfactorily with all aspects of the design, development and use of the siege artillery used by the German Army in the WW1 (especially the 30.5cm Beta-Gerat, the 42cm Gamma-Gerat and the 42cm M-Gerat or Big Bertha) and it has exceeded my expectations. The only not so positive aspect corresponds to the photographic section. The photographs are scarce and of poor quality, although this is also understandable if we consider that these pieces were very few in number and that everything related to them was protected by secrecy. Even the transfers by train were made by covering the pieces with tarps to avoid the stares of the curious. Furthermore, none of these pieces have survived to this day. In short, a highly recommended book.