||Heinz J. Nowarra
||Schiffer Publishing Ltd.
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This revised edition of Grey Wolves of the Sea is devoted by the author, Heinz J. Nowarra, to the history of the most frequently built German types of submarine. The book is somewhat similar to the Squadron Signal giving the reader a brief history of the Typy VII underwater boats and all subtypes. Though all illustrations inside the book are black-and-white, they give people quite clear idea of how deadly and efficient those machines were.