共 7 条
[1]
AMES WR, 1951, AM J PUBLIC HEALTH, V41, P388
[2]
BLIZZARD R M, 1953, J Iowa State Med Soc, V43, P361
[5]
SABIN AB, 1951, AM J PUBLIC HEALTH, V41, P1215
[6]
1950, POPULATION CHARACTER
[7]
1940, 16TH CENSUS US POPUL