共 5 条
[1]
GOLDBERG JP, 1985, B BUREAU LABOR STATI, V2235, P14
[2]
*US BUR LAB STAT, 1947, ACT BUR LAB STAT WOR, P14
[3]
YOUNG DE, 1962, UNPUB COOPERATIVE FE, P23
[4]
1969, B BUREAU LABOR STATI, V1606
[5]
1928, MONTHLY LABOR RE DEC, P40