"The time trails led him to mastodons, money and the most amazing mystery of all: time."
Published as Catface in the UK. A cat-faced alien stranded in drift-free Wisconsin befriends locals and time-engineers portals into prehistoric epochs, where they establish a new nation: Mastodonia
Mastodonia
ISBN: 034527427X
ISBN 13: 9780345274274
Publication Date: September 12, 1978
Publisher: Del Rey Books (NY)
Author: Clifford D. Simak
