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FOSSIL DICOTYLEDONOUS WOODS FROM YELLOWSTONE NATIONAL PARK, 11.WHEELER EF; SCOTT RA; BARGHOORN ES et al.1978; J. ARNOLD ARBORETUM; U.S.A.; DA. 1978; VOL. 59; NO 1; PP. 1-31; H.T. 5; BIBL. 3 P. 1/2; 5 ILL.Article

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