Fertilizer Resources of the United StatesUnited States Dept of Agriculture, United States Bureau of Soils, Frank K. (Frank Kenneth) 18 Cameron · First published 2023Open the Tome
The Soil SolutionFrank K (Frank Kenneth) 18 Cameron · First published 2010 · Latest edition 2021Open the Tome
Potash From KelpFrank Kenneth Cameron, United States. Bureau of Soils · First published 2018Open the Tome
