The efficiency of a tumor registry in a hospital is increased if the institution maintains a complete, current disease index that can be used for checking the registry. An index coded according to the Standard Nomenclature of Diseases and Operations and maintained on punched cards in order of code numbers can be rapidly sorted for various purposes. Cards filed in such a way as to keep types of disease together imply a scattering of the cards with respect to the location of disease, and vice versa. A linear system designed to keep cards together that are related in one sense inevitably implies that cards related in any other sense will be scattered. This difficulty practically vanishes because of the rapidity of sorting when punched cards are used. It is possible to exclude any desired category of disease conditions and to locate any desired type of patient.
Vermillion CO. LOCATION OF TUMOR DIAGNOSES IN A STANDARD NOMENCLATURE PUNCHED-CARD DISEASE INDEX. JAMA. 1957;165(17):2184–2185. doi:10.1001/jama.1957.02980350042010