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by Hansen, Robert C.
by Hansen, Robert C.; Collin, Robert E.
by Ensminger, Jean; Gwako, Edwins Laban; Acheson, James M.; et al.
by Herrnson, Paul S.; Green, John C.; Bibby, John F.; et al.
by Hansen, James C.; Rossberg, Robert H.; Cramer, Stanley H.
by Robert C Hansen
by Pinto, Robert C.; Hansen, Hans V.
by Robert C. Hansen
by Robert C. Hansen; Robert E. Collin (Case Western Reserve Univ.)