The Mystery on Walrus Mountain (Ghost Twins)
by Dian Curtis Regan
ISBN 13: 9780590134750
Format: Paperback (144 pages) Publisher: Scholastic Hippo Published: 15 Mar 1996
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One Wish Pond (Ghost Twins S.)
ISBN 13: 9780590133227
Format: Paperback (144 pages) Publisher: Scholastic Hippo Published: 20 Oct 1995
The Mystery at Kickingbird Lake (Ghost Twins # 1)
ISBN 13: 9780590133210
Format: Paperback (128 pages) Publisher: Scholastic Hippo Published: 20 Oct 1995
How Do You Know It's Easter? (Springtime Life-The-Flap Books)
by Dian Curtis Regan, Fumi Kosaka
ISBN 13: 9780689861550
Format: Hardcover (24 pages) Publisher: Little Simon Published: Feb 2004
Ghost Twins: Missing Moose Mystery No. 4 (Hippo ghost)
by Dian Curtis Regan,Steiner Lund
ISBN 13: 9780590135962
Format: Paperback (144 pages) Publisher: Scholastic Hippo Published: 21 Jun 1996