Platt, John I. Simple geological structures: a series of notes and map exercises / by John I. Platt and John Challinor. - 4th ed. - London : Thomas Murby, 1968 [Reprinted 1970] - 56 p. : ill. ; 25 cm. ISBN: 0045500045 Subjects--Topical Terms: GeologyGeology, Structural. Dewey Class. No.: 551.8 / PLS 1970