00310nam a2200109Ia 450000500170000000800410001708200140005810000090007224500650008126000460014630000080019220260224041017.0260224s9999||||xx |||||||||||||| ||und||  a641.1 NRC  aNRC  0aSupplement, energy for rural development: renewable resour..  aWashington: National Academy Press c1961  a238