Publisher:G. K. Hall & Co.

History
Wikipedia does not have an article for this publisher though it is mentioned on the pages for:
 * Gregg Press
 * Gale

A data point from December 2000 is which is a Large Type publication.
 * The half-title page has a logo that in the lower-right corner: [[Image:G.K. Hall (logo-2000).png]]
 * The title page has "G.K. Hall & Co. &bull; Torndike, Maine"
 * The copyright page has "G.K. Hall Large Print Science Fiction Series." and no other publisher identification nor an address.
 * The back cover has "G.K. Hall &amp; Co."
 * The spine has the same logo as what's on the half-title page.
 * The publication was manufactured with the cover artwork and text printed directly on the cover. It also has a jacket with the same artwork. The material on the jacket flaps was not included on the inside of the manufactured cover.
 * It appears the publication was manufactured for the school and/or library market. There is no price stated and if the jacket is torn/damaged then it can be removed to expose the same artwork that's printed on the cover. The copy transient-verified was from a public library.