by TUSCHAK, GEORGE, BACKHAUS, KARL L
Year of Publication 27.12.1977

by TUSCHAK, GEORGE, BACKHAUS, KARL L
Year of Publication 27.09.1977

by BACKHAUS; KARL L, TUSCHAK; GEORGE
Year of Publication 20.05.1975

by BACKHAUS; KARL L, TUSCHAK; GEORGE
Year of Publication 25.02.1975

by BACKHAUS; KARL L, FASTERT; HERBERT, JOHN; WOLFGANG
Year of Publication 17.08.1976

by HELMS JIMMY L, TEGTMEIER RICHARD J, BACKHAUS KARL L
Year of Publication 10.07.1979

by HELMS JIMMY L, TEGTMEIER RICHARD J, BACKHAUS KARL L
Year of Publication 30.03.1979

by HELMS, JIMMY L, TEGTMEIER, RICHARD J, BACKHAUS, KARL L
Year of Publication 04.04.1978

by BACKHAUS; KARL L, HELMS; JIMMY L, TEGTMEIER; RICHARD J
Year of Publication 03.02.1976

by JIMMY L. HELMS, KARL L. BACKHAUS, RICHARD J. TEGTMEIER
Year of Publication 17.07.1975

by BACKHAUS; KARL L, HELMS; JIMMY L, TEGTMEIER; RICHARD J
Year of Publication 15.04.1975

by L. BACKHAUS,KARL, TUSCHAK,GEORGE
Year of Publication 05.06.1975

by BACKHAUS, KARL L., WEST NEW YORK, HELMS, JIMMY L., RIDGEWOOD, TEGTMEIER, RICHARD J., NEWTON, PA
Year of Publication 18.07.1974