Cover image not available
Originally published: Boston, Mass.: Houghton Mifflin, 1983; London : Gollancz, 1984.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The sign of the beaver by Elizabeth George Speare. ISBN 0003300293. Published by Collins in 1986. Publication and catalogue information, links to buy online and reader comments.