Frewer, Glyn. Adventure in Forgotten Valley / [electronic resource] / by Glyn Frewer ; illustrated by Dirk Gringhuis.. — 1st American ed.. — New York : : Putnam,, [1964, c1962]. — 190 p. : : ill. ; 21 cm. LCCN: 64018040 Subjects--Topical Terms: Dinosaurs--Juvenile fiction.Caves--Juvenile fiction. LC Class. No.: PZ8.F898 / Ad2