共 10 条
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COLEMAN PJ, 1982, MMWR-MORBID MORTAL W, V32, pSS31
[2]
NILSEN DM, 1984, J EARLY ADOLESC, V4, P189
[4]
1985, CHILD LABOR B, V101
[5]
1982, SUPPLEMENTARY DATA S
[6]
1983, CENSUS POPULATION HO
[7]
1971, WH PUBLICATION US DE, V1323
[8]
1982, BUREAU LABOR STATIST, V2130
[9]
1980, INTERIM REPORT C OCC
[10]
1984, CHILD LABOR B, V102