Steven J. Zaloga 
T-34/76 Medium Tank 1941 45 [PDF ebook] 

The T-34 was the most influential tank design of World War 2. When first introduced into combat in the summer of 1941, it represented a revolutionary leap forward in tank design. Its firepower, armour protection and mobility were superior to that of any other medium tank of the period. This superiority did not last long. While the T-34 underwent a series of incremental improvements during 1943, it was being surpassed by new German tank designs, most notably the Panther. This title traces the life of the original T-34 through all its difficulties to eventual success.