Species ruborum : Monographiae generis rubi prodromus. /Author: Focke, Wilhelm Olbers,
Publisher: Stuttgart : E. Schweizerbart,
Date: 1910-14. This title can be found in 1 Iowa libraries.
Die Pflanzen Mischlings; ein Beitrag zur Biologie der Gewachse.Author: Focke, Wilhelm Olbers,
Publisher: Berlin Gebruder Borntraeger,
Date: 1881. This title can be found in 2 Iowa libraries.
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