Books by John Andreas Widtsoe, A.M., Ph. D
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Dry-Farming: a System of Agriculture for Countries under a Low Rainfall
Author(s): John Andreas Widtsoe, A.M., Ph. D
ISBN-13: 9781426419089
Dry-Farming: a System of Agriculture for Countries under a Low Rainfall
Author(s): John Andreas Widtsoe, A.M., Ph. D
ISBN-13: 9781426420191