Avila, Elena Hidalgo de Sustainable development perception of members of small-farm families, San Juan, Argentina Elena Hidalgo de Avila. - East Lansing, Mich. Michigan State University 1991. - 127 pages ; 24 cm. Thesis (Ph. D.) - Michigan State University, 1991 Subjects--Topical Terms: Economic development--Environmental aspects Subjects--Geographic Terms: San Juan (Argentina)--Economic conditions