Isaac Asimov's Science Fiction Magazine: February 1979 Cover: Jack Gaughan (for "To Fill the Sea and Air")

Featured stories:
"To Fill the Sea and Air" by F. Paul Wilson
"In the Cellar" by Larry Niven
"Back to Byzantium" by Leah Palmer
"Proud Rider" by Barry B. Longyear (a "Circus World" novelette)
"Nothing for Nothing" by Isaac Asimov
"A Bait of Dreams" by Jo Clayton (novella - incorporated into A Bait of Dreams.)

Article "On Kepler, Newton, & Company" by George O. Smith.