Little Banana 5

Those stamps are (left to right) The Pan American Union Building, U.S. President James Monroe, and the "spirit" (goddess?) of Commerce. I've had this 1951 reference guide to U.S. stamps sitting around for years. But I think this is the first time I've actually used any of it.

Shown smaller than the original completed size of 2550 X 3600.

See one original source here.