Gressler, P. (1907). Über die Substanzquotienten von Helianthus annuus.
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Dyfyniad Arddull Chicago
Gressler, Paul. Über Die Substanzquotienten Von Helianthus Annuus. Bonn, 1907.
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Dyfyniad MLA
Gressler, Paul. Über Die Substanzquotienten Von Helianthus Annuus. 1907.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.