Mung'ong'o, Claude Gasper The relationship between core and expansion areas in stressed envinronments. a study of socioecologyical interdependencies in a semi-arid area in central Tanzania - Dar es Salaam University of Dar es Salaam 1993 - 49p. 29cm. ISBN: 9976 69 026 6 Subjects--Topical Terms: Environments LC Class. No.: IRA H62.5.T3E35 No.82