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Biographical Directories:
Entry in Henry F. Withey, A.I.A., and Elsie Rathburn Withey, Biographical Dictionary of American Architects (Deceased) (Los Angeles: New Age Publishing Company, 1956. Facsimile edition, Hennessey & Ingalls, Inc., 1970)
Obituaries:
Journal of the American Institute of Architects, death notice, February 1923. A fuller obituary never appeared in later issues. The index to the 1923 issues of the Journal lists his name as Harry P. Knowles.
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