"elrod, j m. "
construction and adaptation of the unit card: / j.m. elrod - 2 ed. - uk : the scarecrow press 1978. - "viii, 71p.; 21 cm."
Z674 / .E47 1966
construction and adaptation of the unit card: / j.m. elrod - 2 ed. - uk : the scarecrow press 1978. - "viii, 71p.; 21 cm."
Z674 / .E47 1966