HUBBARD, L. Ron (1911-1986). Slaves of Sleep. Chicago: Shasta Publishers, 1948. 8vo. Original publisher's gray cloth gilt-lettered on spine; original printed dust jacket illustrated by Hannes Bok (some minor creasing and chipping primarily to corners, slight toning). FIRST EDITION of Hubbard's science fantasy novel, which originally appeared in a 1939 issue of the American pulp fantasy fiction magazine Unknown. Currey 256.