Volume 1 has one of, if not the, biggest collections of Ausf A images gathered together in one publication. It also has in depth cover of Ausf B & C with images from Poland, France, the Balkans and Russia. This volume has turned into the longest of the 4.
One thing that came up while writing this and during discussions with Bam (my proof reader) was the nature of the auxilliary exhaust on Ausfs B and C. The perceived wisdom was that this exhaust was significantly shorter on the B. Photo evidence in this book show that this is maybe not as clear cut as current diagrams show. Unfortunately reaching a clear designation for this item is not yet possible. Also a type of tyre specific to Ausf A is identified.