共 10 条
- [1] DUBLIN LI, 1936, LENGTH LIFE STUDY LI
- [2] *FED SEC AG SOC SE, 1942, SOC SEC YB 1941, P131
- [3] HAGOOD MJ, 1947, FARM OPERATOR FAMILY, P1
- [4] Sydenstricker E, 1933, HLTH ENV
- [5] *US BUR CENS, 1944, VIT STAT SPEC REP, V19, P31
- [6] *US BUR CENS, 1921, US LIFE TABLES 1890
- [7] *US BUR CENS, 1945, VIT STAT SPEC REP, V23, P1
- [8] *US PHS, 1947, VIT STAT SPEC REP, V23, P243
- [9] *US PHS, 1947, VIT STAT SPEC REP, V23, P281
- [10] *US PHS, 1947, VIT STAT SPEC REP, V23, P299