by KOBERT JORDAN R, KEEFER DAVID E, HUDAK WILLIAM N
Year of Publication 18.08.2011

by KOBERT JORDAN R, KEEFER DAVID E, HUDAK WILLIAM N
Year of Publication 07.06.2011

by Hudak, William N, Keefer, David E, Kobert, Jordan R
Year of Publication 07.06.2011

by KOBERT JORDAN R, KEEFER DAVID E, HUDAK WILLIAM N
Year of Publication 11.09.2008

by KEEFER DAVID E
Year of Publication 20.02.1968

by DAVID E. KEEFER
Year of Publication 14.12.1965

by DAVID E. KEEFER
Year of Publication 23.11.1965

by DAVID E. KEEFER
Year of Publication 19.01.1965

by KEEFER DAVID E
Year of Publication 03.11.1964

by KEEFER DAVID E
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by KEEFER, DAVID E, KIM, DONGSUNG R
Year of Publication 15.05.1979

by E. KEEFER,DAVID
Year of Publication 31.10.1968

by EDWIN W. HERRON, DAVID E. KEEFER, ROBERT D. HUNTER
Year of Publication 05.10.1971

by EDWIN W. HERRON, DAVID E. KEEFER, ROBERT D. HUNTER
Year of Publication 29.12.1970

by KEEFER DAVID E
Year of Publication 23.01.1964

by DAVID E. KEEFER, JOHN E. WILHITE, ROBERT D. HUNTER
Year of Publication 09.12.1969

by DAVID E. KEEFER, LASZLO L. RAKOCZI, GARY J. GOSS, ERNEST J. PORCELLI
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by DAVID E. KEEFER, JOHN E. WILHITE, THOMAS J. BEATSON, RICHARD M. ROJKO
Year of Publication 17.09.1968

by KEEFER DAVID E, BEATSON THOMAS J, WILHITE JOHN E, ROJKO RICHARD M
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by KEEFER DAVID E, DONOHOE LEONARD J, NICOLAU NICK G, FRITZ ARTHUR D
Year of Publication 31.01.1967