海量图书期刊资源，随时随地畅享阅读乐趣
Coal-ball floras of Maritime Canada and palynology of the Foord seam: geologic, paleobotanical and paleoecological implicationsPaul C. Lyons; Erwin L. Zodrow; Michael A. Millay; Graham Dolby; Kevin S. Gillis; Aureal T. Cross · 1997