[How to Become a Ventriloquist and Imitator of Animal Sounds. The Knowledge, History and Learning of the Art of Ventriloquizing].
An uncommon book in German language with a stunning and bizarre art deco cover gives a detailed insight on the history of the ventriloquizing of animal sounds from the 16th century until 1920s, and includes instructions for the beginners. The author Gregor von Coellen was an editor of a magazine Artist.
The book was issued in a series of popular esoteric pocket books, which were used and often thrown away, after they went out of fashion, that is why the survival rate of such pamphlets is very low. This is a third edition of the book.
We could only find three institutional examples of the first edition (OCLC 72100683) and one example of this third edition (Deutsche Nationalbibliothek, OCLC 73044264).