| Masters of French Music
Arthur Hervey | |
| Masters of Space
E. E. Smith; E. Everett Evans | |
| Masters of Space / Morse and the Telegraph; Thompson and the Cable; Bell and the Telephone; Marconi and the Wireless Telegraph; Carty and the Wireless Telephone
Walter Kellogg Towers | |
| Masters of the English Novel: A Study of Principles and Personalities
Richard Burton | |
| Masters of the Guild
Louise Lamprey | |
| Masters of the vortex
E. E. Smith | |
| Masters of the Wheat-Lands
Harold Bindloss | |
| Masters of Water-Colour Painting
Unknown | |
| Mastery of Self for Wealth, Power, Success
Frank C. Haddock | |
| Matchmaker
Charles L. Fontenay |
