The T3 Light Tank was an attempt to get a lighter vehicle in order to fit the new US classification for light tanks.
Revolutionary T3 Tank: The Christie Suspension Breakthrough
WW2 French Light Tanks Archives - Tank Encyclopedia
T-34, Soviet tank
WW2 US Light Tanks Archives - Tank Encyclopedia
Cold War US Light Tank Prototypes Archives - Tank Encyclopedia
WW2 US Light Tank Prototypes Archives - Tank Encyclopedia
1942 Combat Damage Analysis of the T-34 and T-70 tanks - Tank Encyclopedia
United States of America (WW2) - Tank Encyclopedia
Medium Tank M3 Lee/Grant - Tank Encyclopedia