[No place, no printer], 1931. 8vo. Without wrappers (as issued). Offprint from: "Journal of the American Statistical Association", June, 1931. Fine and clean. Pp. 135-149.
Scarce offprint of Hotelling's important paper on in which it for the first time is statistically demonstrated that a delayed dip in birthrates will occur with populations iwhen subjected to harvest failures or epidemics.