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*HEALTH INS I, 1968, SOURCE BOOK HEALTH I
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*NAT CTR HEALTH ST, 1964, HEALTH INSURANCE 10
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*US BUR LAB STAT D, 1970, MONTHLY LABOR REV
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*US BUR LAB STAT D, 1955, MONTHLY LABOR REV
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*US BUR LAB STAT D, 1953, MONTHLY LABOR REV
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*US BUR LAB STAT D, 1961, MONTHLY LABOR REV
[10]
*US BUR LAB STAT D, 1969, MONTHLY LABOR REV