Pugnacious Peacemaker / The Wheels of If(1990)
An omnibus of novels by L Sprague de Camp and Harry Turtledove
New York can be full of surprises. For streetwise attorney Allister park, today's surprise is finding himself in a New York that calls itself New Belfast, speaks something halfway between Old English and Dutch, and rules over a country call Vinland. Ever more surprising is that Allister appears to be inhabiting the body of one of Bishop Ib Scoglund, a major player in New Belfast political affairs - and it looks like he's going to have to play the Bishop's part to the hilt if he wants even a prayer of a chance to return home!
Used availability for Harry Turtledove's Pugnacious Peacemaker / The Wheels of If
March 1990 : USA Paperback