The Battle for Stalingrad
 
Highlights or must read section.

Stalingrad, the decisive battle of World War II.

Red Army engineers at Stalingrad

The Volga crossings during the battle

The Russian ultimatum of 8 January 1943 to the 6th Army

War diary of the battle

Maps

Pavlov's House 

The Stalingrad air-lift

The 21 Ia Officers trapped in the Stalingrad pocket

Battle report of Kampfgruppe Simons (German and English)

Signal communications in the pocket of Stalingrad