Needed population research /
Whelpton, P. K.
Needed population research / by P. K. Whelpton - Lancaster, Pennsylvania : The Science Press Printing Co., 1938 - xv, 196 p. ; 23 cm.
Population--Research
Needed population research / by P. K. Whelpton - Lancaster, Pennsylvania : The Science Press Printing Co., 1938 - xv, 196 p. ; 23 cm.
Population--Research
