Sampling particular instance papers
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[1] B. Lennox,et al. Summaries and selective destruction as a solution to the hospital record storage problem. , 1967, Lancet.
[2] Kenneth A. Hardy,et al. Quantitative Methods for Historians: A Guide to Research, Data, and Statistics , 1991 .
[3] Gladys L. Palmer. Factors in the Variability of Response in Enumerative Studies , 1943 .