The Coming of the Mongol Hordes
From Author Wars - https://authorwars.com/books/the-coming-of-the-mongol-hordes-1917151.html
Overview:
- Title: The Coming of the Mongol Hordes
- Author: Emile C. Tepperman
- Year: 1938
- Type: Novels
- Series: Operator #5
- Number in Series: 37