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On sale date from the publication date as submitted to the U.S. Copyright Office found in the Catalog of Copyright Entries; Part 1; Group 2; Pamphlets, Leaflets, Contributions to Newspapers or Periodicals, Etc.; Lectures, Sermons, Addresses for Oral Deliveries; Dramatic Compositions; Maps; Motion Pictures., 1920, New Series Volume 17, Number 10. Affidavit of publication arrived at Copyright Office on September 15, 1920. Two copies submitted to copyright office on September 20, 1920. Registered as class A book. Copyright registration number 576449. Copyright given to B. Fisher, New York.