A. Engler's Syllabus der Pflanzenfamilien :
mit besonderer Berücksichtigung der Nutzpflanzen nebst einer Übersicht über die Florenreiche und Florengebiete der Erde.

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Item Link Original Source
Limited (search only)   v.1 Rutgers University
Limited (search only)   v.1 University of California
Limited (search only)   v.1 University of Colorado Boulder
Limited (search only)   v.1 University of Michigan
Limited (search only)   v.1 1954 University of California
Limited (search only)   v.2 University of Georgia
Limited (search only)   v.2 University of Colorado Boulder
Limited (search only)   v.2 University of Michigan