"The Grim Reaper" by Roger Ford
ISBN 1 885119 41 0
My edition is dated 1996 so it is a bit out of date, however it doses give a lot of the background and development of the machine gun. It doses not have a lot of pictures or technical information. Nor doses the book have any detailed list's of guns referred to or manufactured.
For a good starter though it doses quite well.Information
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