See Novellas here and Short Stories here – thanks to Carla for supplying details of the original publications.

Novelettes

“Bridle and Saddle,” by Isaac Asimov

• Original publication in Astounding
• Foundation, as mentioned above.
• Men Against the Stars, ed. Martin Greenberg
• Astounding Stories: The 60th Anniversary Collection (Vol. 2)

“Foundation,” by Isaac Asimov

• Original publication in Astounding
• Foundation, as mentioned above.
• Isaac Asimov Presents The Great SF Stories 4 (1942), as mentioned above
• Isaac Asimov Presents The Golden Years of Science Fiction: 2nd Series, as mentioned above
• Galactic Empires, vol. 1, ed. Brian W. Aldiss

“Goldfish Bowl,” by Robert A. Heinlein

• Original publication in Astounding
• Apeman, Spaceman: An Anthology of Anthropological Science Fiction, ed. Leon E. Stover, Harry Harrison
• The Menace from Earth, Robert A. Heinlein collection
• Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein
• The Unexplained: Stories of the Paranormal, ed. Ric Alexander

“The Star Mouse,” by Fredric Brown

• Original publication in Planet Stories
• Available for free here.
• Isaac Asimov Presents The Great SF Stories 4 (1942), as mentioned above
• Isaac Asimov Presents The Golden Years of Science Fiction: 2nd Series, as mentioned above
• The Fredric Brown Megapack: 33 Classic Tales of Science Fiction and Fantasy, as mentioned above.
• Adventures in Time and Space, as mentioned above
• Already Among Us: An Anthropomorphic Anthology, ed. Fred Patten
• And the Gods Laughed, Fredric Brown collection
• Daymares, Fredric Brown collection
• Space on My Hands, Fredric Brown collection

“There Shall Be Darkness,” by C.L. Moore

• Original publication in Astounding
• Available for free here.
• Journey to Infinity ed. Martin Greenberg
• Miracle in Three Dimensions, C. L. Moore collection

“The Weapon Shop,” by A.E. van Vogt

• Original publication in Astounding
• Available for free here.
• Isaac Asimov Presents The Golden Years of Science Fiction: 2nd Series, as mentioned above
• Adventures in Time and Space, as mentioned above
• The Best of A. E. van Vogt
• Freedom!, eds. Mark Tier, Martin H. Greenberg
• Give Me Liberty, eds. Martin H. Greenberg, Mark Tier
• M 33 in Andromeda, A. E. van Vogt collection
• The Prentice Hall Anthology of Science Fiction and Fantasy, ed. Garyn G. Roberts
• Science Fiction Hall of Fame, Vol One ed. Robert Silverberg
• War and Peace: Possible Futures from Analog ed. Stanley Schmidt