Ragan, Donal M. Structural geology : an introduction to geometrical techniques / Donal M. Ragan. - 4th ed. - Cambridge ; New York : Cambridge University Press, 2009. - xvii, 602 p. : ill. ; Includes bibliographical references (p. 578-594) and index. ISBN: 9780521897587 (hardback) 9780521745833 (pbk.) Subjects--Topical Terms: Geology, Structural. Dewey Class. No.: 551.8 / RAG.S