Orr, Catherine Elizabeth. Geology [electronic resource] / [by] Catherine E. Orr [and] M. Vere DeVault. Illustrated by Ralph White.. — Austin, Tex., : Steck Co., [1959]. — 47 p. : illus. 23 cm. LCCN: 59005567 Subjects--Topical Terms: Geology--Juvenile literature. LC Class. No.: PZ10.O7 / Ge