边缘开槽卡片上的倒排索引。

Science. 1963 Oct 11;142(3589):227-8. 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.

在反向索引系统中，边缘有缺刻的卡片可用于令人满意地分析研究数据，这些数据涉及一小群个体，但在一个短期研究项目中有大量高度可变的特征。