McCallum, B. (1977). Environmentally appropriate technology: Renewable energy and other developing technologies for a conserver society in Canada (4th ed.). [Canada]: Fisheries and environment.
Παραπομπή Chicago StyleMcCallum, Bruce. Environmentally Appropriate Technology: Renewable Energy and Other Developing Technologies for a Conserver Society in Canada. 4th ed. [Canada]: Fisheries and environment, 1977.
Παραπομπή MLAMcCallum, Bruce. Environmentally Appropriate Technology: Renewable Energy and Other Developing Technologies for a Conserver Society in Canada. 4th ed. [Canada]: Fisheries and environment, 1977.
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