Text ( visual ) : unmediated Choice in field surveying / by Roger P. Kirby. -- : pbk.. -- Norwich : Geo Books , c1985. -- 48 p. : ill. ; 21 cm. -- (Concepts and techniques in modern geography ; no. 41). -- Caption title ; Bibliography: p. 45-48. -- ISBN 0860941744 ; (BA04506796) ; https://ci.nii.ac.jp/ncid/BA04506796 Author Heading(s): Kirby, Roger P.. -- Classification(s): NDC8 : 290.19 ; LCC : TA545 ; DC19 : 526.9 ; NDLC : G82. -- Subject Heading(s): LCSH : Surveying