共 6 条
[1]
COLLINS SD, 1953, PUBLIC HLTH SERVICE, V213
[2]
COLLINS SD, 1957, PUB HLTH MONOGR, V48
[3]
*US NAT OFF VIT ST, 1958, MONTHL VIT STAT REP, V7
[4]
*US NAT OFF VIT ST, 1957, MONTHL VIT STAT REP, V6
[5]
1958, MORBIDITY MORTALITY, V7
[6]
1957, MORBIDITY AND MORTAL, V6