Books by Royall Douglass:
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Douglass, Royall: Prison Verse (Palo Alto, CA: Altruria Press, c1911) (multiple formats at archive.org)
Additional books by Royall Douglass in the extended shelves:
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Douglass, Royall: Prison verse (Altruria Press, 1911), also by California State Prison at San Quentin (page images at HathiTrust)
Find more by Royall Douglass at your library, or elsewhere.