Thanks to Matthias Echtermeyer (Backeberg heir) and Gottfried Gutte (our contact with Matthias Echtermeyer) for authorizing these electronic versions of the documents.
Under copyright (with permission)
Often cited by Backeberg in Die Cactaceae. Rare catalogue of 44 pages containing plant lists, pictures (B&W), short descriptions, advertisement…
Under copyright (with permission)
A selection of many pictures, often used later in his publications.
Under copyright (with permission)
A small catalogue with some pictures and descriptions.
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