First Book Club printing with code D44 [October 1973], verified by ISFDB. Tight, clean, flat, square, sharp and crisp book in DJ with light wear and rubbed tips. First book and first appearance of each of these novellas. 

Seven Great Original Science Fiction Stories
Volume 3 in editor Terry Carr's original anthology series from the late 60s thru the 70s.
Introduction (1973) essay by Terry Carr
The Death of Dr Island/Archipelago (1973) novella by Gene Wolfe
The Ghost Writer (1973) story by George Alec Effinger
Many Mansions (1973) novelette by Robert Silverberg
Randy-Tandy Man (1973) story by Ross Rocklynne
The World Is a Sphere/Tales of a Darkening World (1973) novelette by Edgar Pangborn
The Legend of Cougar Lou Landis (1973) story by Edward Bryant
Free City Blues (1973) novelette by Gordon Eklund