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Ace Science Fiction Double #D-173:
'The Man Who Mastered Time' by Ray Cummings, cover artist by Ed Valigursky
'Overlords From Space' by Jospeh E Kelleam.
Printed 1956 with copyrights from 1929 and 1956
This book is in very good condition, it is square and relatively tight. It has signs of reading use, with minor creases along the spine on both covers. One reading crease is on the 'Mastered Time' cover. There is some chipping along the edges, but not significant. There is a penciled monogram on the inside title page of one story and a small scribble on the inside of one cover.