The Secret of the Sphinx

From Author Wars - https://authorwars.com/publications/the-secret-of-the-sphinx-296377.html

Overview:

Title: The Secret of the Sphinx
Author: Hans P. Dreyer
Year: 1929
Publisher: Burton Publishing Co.
Pages: 228
Binding: Hardcover
Type: Novel
Title Reference: The Secret of the Sphinx
Notes: Unknown