Text ( visual ) : unmediated Two-dimensional geometries : a problem-solving approach / C. Herbert Clemens. -- Providence, RI : American Mathematical Society , c2019. -- vii, 142 p. : ill. ; 26 cm. -- (The Sally series ; . Pure and applied undergraduate texts ; 34). -- Includes bibliographical references (p. 139) and index. -- ISBN 9781470447601 ; (BB28033211) ; https://ci.nii.ac.jp/ncid/BB28033211 Other Title(s): Two dimensional geometries ; 2 dimensional geometries. -- Author Heading(s): Clemens, C. Herbert (Charles Herbert). -- Classification(s): LCC : QA501 ; DC23 : 516/.154. -- Subject Heading(s): LCSH : Geometry, Descriptive