The shrinking of Treehorn. Originally published: New York: Holiday House, 1971
Treehorn's treasure. Originally published: New York: Holiday House, 1981
Treehorn's wish. Originally published: New York: Holiday House, 1984.
The Treehorn trilogy by Florence Parry Heide. ISBN 9780810959941. Published by Harry N. Abrams in 2006. Publication and catalogue information, links to buy online and reader comments.