A Sea Serpent: Story of a Northosaur
by L.B. Halstead, Jenny Halstead
ISBN 13: 9780001041233
Format: Hardcover (32 pages) Publisher: Collins Published: 27 Sep 1984
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Dinosaurs (Piccolo Picture Books)
by Giovanni Caselli, L.B. Halstead
ISBN 13: 9780330245722
Format: Paperback (32 pages) Publisher: Macmillan Published: Mar 1976
Evolution of the Mammals
by L.B. Halstead
ISBN 13: 9780856540301
Format: Hardcover (120 pages) Publisher: P.Lowe Published: 01 Oct 1978