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.
Under copyright (with permission)
A series of periodic issues containing plant descriptions (with B&W pictures) and the classification according to Backeberg from 1934 to 1938. This four-language periodical was written in german, english, dutch and french. It aimed at being the world-wide reference among cactus publications.
The non-german texts were wrtitten by various people. The translations are sometimes very coarse if not wrong. Furthermore, typesetting is not very rigorous. Some corrections have been made in the interpreted file, however we recommend to refer essentially to the german text by Backeberg himself.
Under copyright

This is the monumental work by Curt Backeberg, published from 1958 to 1962. More than 4000 pages and 3500 pictures in 6 volumes.

This book is still under copyright. In spite of our efforts it has been impossible to find any interested party. The book is nevertheless proposed owing to its historical interest. A reprint is unlikely since Backeberg's concepts do not fit any more modern botanical standards. However, if you can help solving the ownership problem, please contact us.