Tiffen, Mary. Environment, population growth and productivity in Kenya : a case study of the Machakos District - London International institute for environment and development 1994 - 27p. Illustration - Dryland Networks Programme issues pape . - No. 47 . ISSN: 1357 9312 Subjects--Topical Terms: Agricultural industries GeographyGeography Dewey Class. No.: 338.1 / TIF