KG Murray's Superman Super Library #39 was published c.August 1967:
Also as per the established pattern, the stories in this issue are reformatted for the digest-sized edition and recycled from previously published KG Murray issues. The three stories in this issue are as follows:
The Girls in Superman's Life!, originally published in Superman #78, September-October 1952, previously published in Super Adventure Comic #47.
Superman's Super Hold-Up!, originally published in World's Finest Comics #59, July 1952, and previously published in Super Adventure Comic #42.
Superman's Secret Workshop, originally published in Superman #81, March-April 1953, and previously published in Super Adventure Comic #46.
A one -page Casey the Cop filler strip appears on the inside rear cover which originally appeared in Superboy #109, December 1963. I have not identified an earlier printing of this in a KG Murray comic.
The date code on the rear cover advertisement is KGMSSL867. My copy is also stamped 22 SEP 1967.