Solar Grain Drying - Progress and Potential
By George H. Foster and Robert M. Peart
Published by United States Department of Agriculture in November 1976
Published during the energy crisis of the mid 70's, this bulletin from the United States Dept. of Agriculture promotes the design and implementation of solar grain drying technology in farming operations.
The image below is a scan of the cover of the bulletin. A link to the complete bulletin in pdf format can be found here. https://library.uniteddiversity.coop/Energy/Solar/Solar_Grain_Drying.pdf
Excerpt (page 12): "FUTURE OF SOLAR GRAIN DRYING The adoption rate of solar grain drying depends on the supply and price of fossil fuel as well as the availability or allocation of scarce fuel supplies to agricultural production."