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World pollen and spore flora, ISSN 0346-4601, 1973
Journal
1969, ISBN 9780122936524, v.
Book
Journal
Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, 11/2009, Volume 106, Issue 46, pp. 19334 - 19339
Journal Article
Advances in pollen-spore research, ISSN 0376-480X, 1974
Journal
1969, Pictured-key nature series., ISBN 9780697048486, ix, 249
Book