Cover art
Gould, Steven. Wildside. Tor 1996.

Gould, Steven. Wildside
Summary: Teen-agers discover a gate to an uninhabited version of North America. The end of the book reveals connections to a third world in which the Industrial Revolution ran amok.
Published: Tor 1996 (0312854730), 1997 (0812523989BUY), 2003 (0765342464BUY); and SFBC 1996.