Mark II coding sheets (1) Problem Sheet PRNC-NPG-68 (Rev. 12-49) Navy-DPPO PRNC, WASH., D.C. (4 copies) could do 30 lines of coding (2) an earlier version of the coding sheet (1 copy) could do 60 lines of coding
Physical Sciences, Division of (NMAH, Smithsonian Institution). Search this
Box 2, Folder 2
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Grace Murray Hopper Collection, 1944-1965, Archives Center, National Museum of American History