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by Hildebrand, David; Ott, R. Lyman; Gray, J. Brian
by Horton, Robert A; Moran, Laurence A.; Scrimgeour, Gray; et al.
by David F. Gray
by Gray, David W.
by Carlson, David Gray
by Gray, David
by Pencheon, David; Melzer, David; Gray, Muir; et al.
by Mcewen, James G.; Bloch, David S.; Gray, Richard M.
by Gray, David R.; National Museum of Natural Sciences; National Museums of Canada