Inverted Indexing on Edge-Notched Cards

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Science  11 Oct 1963:
Vol. 142, Issue 3589, pp. 227-228
DOI: 10.1126/science.142.3589.227


Edge-notched cards in an inverted system of indexing may be used satisfactorily to analyze research data which concern a small series of individuals but a large number of highly variable characteristics in a short-term research project.