Fagan, Margaret, 1930- Challenge for change : geographical approaches to selected world issues / Margaret Fagan, Marilyn Andrews. - Toronto ; New York : Mcgraw-Hill Ryerson, c1977. - 336 p. : ill. ; 24 cm. Includes bibliographical references and index. ISBN: 0070824630 LCCN: 78-316940 Subjects--Topical Terms: Population.Food supply.Economic geography.