Found on the front and back of one of the populated panels.
Larger panels: 3 in x 9 in x 7/8 in; Shorter panel: 3 in x 8 1/4 in x 7/8 in
The record contains 12 panels for the TX-0. Eleven panels have three rows of ten (3x10). Three of those 3X10 hole panels are semi-populated with snap-in plugs. One of the 3x10 panels is slightly shorter than the others. The short ten socket panel is labeled "Not wide enough" and "Do not use".