If you are a twelve-step-rehab-program-considering-image-adict, just like me...here's a handy little list of Photo agencies and photo libraries on the net
(the list is actually missing a personal favourite of mine, French agency ADOC)
Panzer: Pzkpfw IV, Ausf A
The first panzer IV, most likely photographed in 1940-41. With a production run of only thirty-five the Ausf A was never a common sight on the battle field, quickly replaced with later versions incorporating thicker armour and other improvements.