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Taxonomic literature : a selective guide to botanical publications and collections with dates, commentaries and types. Volume V, Sal-Ste - Cowan, Richard S., 1921 -1997 (Bohn, Scheltema & Holkema, 1976)

Taxonomic literature : a selective guide to botanical publications and collections with dates, commentaries and types. Volume II, H-Le - Cowan, Richard S., 1921 -1997 (Bohn, Scheltema & Holkema, 1979)

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