Wikipedia
Earthgrip
Earthgrip is a collection of linked science fiction stories by Harry Turtledove, first published in hardcover by The Easton Press in 1991, and paperback by Ballantine Books in December of the same year. The cover of the paperback edition bears the subtitled "Tales from the Traders' World." It was later gathered together with his novel Noninterference and collection Kaleidoscope into the omnibus collection 3 X T, published in hardcover by Baen Books in 2004.
The book contains two novellas and one novelette.