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by Evenson, Robert; Ranis, Gustav
by Ruttan, Vernon W.; Pray, Carl E.; Evenson, Robert; et al.
by Huffman, Wallace E.; Evenson, Robert E.
by Evenson, Robert E.; Gollin, Douglas; Santaniello, V.
by Johnson, Jeremy Robert; Evenson, Brian
by Vernon W Ruttan; Carl E Pray; Robert Evenson; et al.
by Robert Evenson; Gustav Ranis
by Wallace E. Huffman; Robert E. Evenson
by Evenson, Robert E.; Ranis, Gustav