World War II Order of Battle: An Encyclopedic Reference to U.S. Army Ground Forces from Battalion through Division, 1939-1946 (REVISED EDITION)  (Stackpole Military Classics)
"A remarkable achievement! An invaluable compilation of data derived entirely from original sources. Nothing like it has been done before." --Charles MacDonald, author of A Time for Trumpets: The Untold Story of the Battle of the Bulge