Books by Mason D. Gray:
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Gray, Mason D. (Mason DeWitt), 1876-1928: Latin for Today: Second-Year Course (Boston et al.: Ginn and Co., c1928), also by Thornton Jenkins (page images at HathiTrust)
Additional books by Mason D. Gray in the extended shelves:
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Gray, Mason D. (Mason DeWitt), 1876-1928: Introductory lessons in Latin and English for the Junior high school. Part 1 (Lessons I to XLVI) (s.n.], 1922) (page images at HathiTrust)- Gray, Mason D. (Mason DeWitt), 1876-1928: The teaching of Latin (Appleton, 1929) (page images at HathiTrust)
Find more by Mason D. Gray at your library, or elsewhere.