Text ( visual ) : unmediated Workbook for Historical linguistics / Winfred P. Lehmann. -- Dallas, Tex. : Summer Institute of Linguistics ; [Arlington] : University of Texas of Arlington , 1984. -- 92 p., [6] leaves of maps : ill., maps ; 23 cm. -- (Summer Institute of Linguistics publications in linguistics ; 71). -- Includes index. -- ISBN 0883120909 ; (BA57485184) ; https://ci.nii.ac.jp/ncid/BA57485184 Author Heading(s): Lehmann, Winfred Philipp. -- Classification(s): LCC : P140 ; DC20 : 417/.7. -- Subject Heading(s): LCSH : Historical linguistics