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by Clark, John R.; Siirila, Erkki
by Clark, John W.
by Davis, Raymond E.; Metcalfe, H. Clark; Williams, John E.; et al.
by Clark,John
by Workshop on Bottomland Hardwood Forest Wetlands of the Southeastern un; Clark, John R.; Benforado, Jay
by Clark, John F.
by Clark, John Bates
by Clark, John
by Gray, John Harvey; Gray, Lourdes; McFadden, Steven; et al.