The second photo above is a diagram printed with Alpha-Blox, showing the designation of each character. It also gives an idea of the quantity of each; if stood in a line they would fill each box with its respective character.
The third photo is a proof of all the Alpha-Blox elements printed together in two-color combination.
The fourth is the American Type Founders specimen sheet from 1944. (Elements are displayed individually at the bottom of that specimen, but please note that the quantities shown per font are not applicable to the Skyline set.)