Yazar
w t ackerman
2 cilt bulundu.
Cilt sonuçları
Extension objectives and procedure for rural electrification instruction and demonstration
W. T. Ackerman · United States Department of Agriculture, Extension Service
27 sayfa · 1940
Rural electrification / Home economics extension work
Electricity on New England farms, II
W. T. Ackerman · New Hampshire Agricultural Experiment Station, The University of New Hampshire
54 sayfa · 1932
Electricity in agriculture