Preparing textbook manuscripts : a guide for authors in developing countries / Prepared for Unesco by A. J. Loveridge, F. Cornelsen, L. J. Lewis & I. M. Terekhov - Paris : Unesco , 1970 - 71p. : ill. ; 21 cm. Bibliography: p. 70-71. Subjects--Topical Terms: Textbooks--Authorship Dewey Class. No.: UN 029.6 / LOV