I think I've already watched 6 or 7 of them! The Panzer 3-4 ones are pretty good, but you get good coverage in every subject.
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Tiger I - Panzer II - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant - SECRET PROJECT