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Die TU Berlin hat freundlicherweise das gemeinfreie Standardwerk von Arnold C. Klebs (Erstausgabe 1938) digitalisiert:http://ubsrvgoobi2.ub.tu-berlin.de/viewer/image/9921415155302884/1/LOG_0000/"This was Klebs’ master work, published as a volume of the journal Osiris edited by pioneer historian of science George Sarton at Harvard, and also published separately. It provides a “short” entry for about 3000 editions of over 1000 incunabula on scientific and medical themes. At the end is a cross-reference list of authors’ names. It is a major work of reference that continues to be cited whenever a book dealer offers for sale an incunable listed in the catalog. Klebs collected material for much more expanded bibliographical entries, but was unable to complete the larger project. The research materials are in the Klebs Papers at Manuscripts &#38; Archives." (Yale)#inkunabeln