bls_1775-40_1973.pdf
bls_1775-54_1973.pdf
bls_1775-56_1973.pdf
bls_1950-61_1978.pdf
bls_1900-73_1977.pdf
bls_1950-03_1977.pdf
bls_1950-12_1977.pdf
bls_2050-20_1979.pdf
bls_2050-24_1979.pdf
bls_1775-13_1972.pdf
bls_1775-20_1973.pdf
bls_1775-47_1973.pdf