Books by David D. Seltz:
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Seltz, David D.: 125 Ways to Make Money With Your Typewriter (1952) (HTML at Wayback Machine)
Additional books by David D. Seltz in the extended shelves:
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Seltz, David D.: 125 ways to make money with your typewriter. (World Pub. Co., 1952) (page images at HathiTrust)- Seltz, David D.: 215 successful door openers for salesmen. (Prentice-Hall, 1956) (page images at HathiTrust)
- Seltz, David D.: Sales contests and incentive programs. (Prentice-Hall, 1960) (page images at HathiTrust)
- Seltz, David D.: Successful industrial selling. (Prentice-Hall, 1958) (page images at HathiTrust)
Find more by David D. Seltz at your library, or elsewhere.