Handbook of systematic botany Eugenius Warming

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^ warming 1884.
^ eugenius warming, emil knoblauch (17 may 1890). handbuch der systematischen botanik . gebrüder borntraeger (e.eggers) – via internet archive. 
^ warming 1890.
^ warming, eugenius; knoblauch, emil; potter, michael cresse (17 may 1895). handbook of systematic botany . new york : macmillan & co. – via internet archive. 
^ warming 1912.






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