The Mystery of the iron mask
By: Theodore M. R. von Keler.
Series: Ten cent pocket series ;; no. 34
Publisher: Haldeman-Julius Co.
Published: 1923
Place of publication: Girard, Kan
Language: eng
Number of pages: 64
Subjects: Mattioli, Ercole Antonio, 1640-1703.
Notes: Pages 61-64 contain advertising matter.
Advertised 4 August 1923, Haldeman-Julius Weekly, p. 1.
Later printings issued in Little blue book series wrappers; printings after 1945 lack advertising matter.