BTM Hollerith  HEC  Computer Paper  c1954

BTM Hollerith  550 Electronic Calculator Paper  c1954

BTM Hollerith Punchcard Program (Early Game)  c1954

BTM Hollerith  Information Paper  c1952

BTM Hollerith  Electrical Paper  c1950

BTM Hollerith  Golden Jubilee Tabacus Paper  c1957

BTM Hollerith  555 Electronic Calculator Paper  c1958