McGregor, D. C. 1929- Spores with proximal radial pattern from the Devonian of Canada, by D. C. McGregor. - [Ottawa] Dept. of Mines and Technical Surveys, Canada [1961] - ix, 11 p. plate, table. 25 cm. Abstract in English and French. Bibliography: p. 10-11. LCCN: gs 62000011 Subjects--Topical Terms: Plant spores, Fossil.Paleobotany--Devonian.Paleobotany--Canada. LC Class. No.: QE185 / .A43 no. 76