Note: Upton Sinclair adapted his 1903 novel Prince Hagen: A Phantasy as a play. HathiTrust Digital Library provides full view of the undated Privately Printed edition, including one with the original cover, a Harvard University copy: • Copyright page: -- stamped as received in a 1918 bequest -- copyrights 1903 by L. C. Page & Co., first publisher of the novel, and 1909 by the Valencia Theatre Co., probably as the first version of the adaptation, "tried out" in January • The preceding title page is undated. • The following page states in part (no heading): "Prince Hagen was tried out at the Valencia Theatre, San Francisco, in January, 1909. In the light of the experience thus gained, it has been entirely re-written. It is now privately printed, to be sent out to managers, critics and others who may be interested. ..."