Johnson’s Inventions and Projects. There are two folders of mostly hand-written project ideas and drawings, as well as a transcript of an interview concerning his test scoring machine.
Loose pages (probably from a three-ring binder) showing pictures and short descriptions of products such as Document to Card Punch, card sorter, clocks, and key punch
clippings about the test scoring machine; oral history of Rey Johnson done by Gary Saretzky for the Educational Testing Service Archives (October 27, 1977)