Books by Ashley Pettis:
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Pettis, Ashley, 1892-, contrib.: The Well-Tempered Accompanist (Bryn Mawr, PA: T. Presser Co., c1949), by Coenraad Valentyn Bos (page images at HathiTrust)
Additional books by Ashley Pettis in the extended shelves:
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Pettis, Ashley, 1892-: Music: now and then. (Coleman-Ross, 1955) (page images at HathiTrust)
Find more by Ashley Pettis at your library, or elsewhere.