Fontenay, Charles L. Twice Upon a Time.
Tubb, E. C.. The Mechanical Monarch.
New York: published by Ace Books, Inc. 1958.
Small octavo, pictorial wrappers. Ace double #D-266. First printings and first publications. Twice Upon a Time issued earlier in Great Britain as ENTERPRISE 2115 under pseudonym Charles Grey --Currey. Light wear to covers, wear to edges and corners, creasing to corner; wear to spine corners, creasing to spine; slight cock to book; age tanned end pages; light age tanned text pages; Good.