Soil Fertility And Fertilizers, 8Th EditionJohn L Havlin And Samuel L Tisdale · First published 2017Open the Tome
Soil TestingJohn L. Havlin, Jeffrey S. Jacobsen · First published 1994 · Latest edition 2015Open the Tome
Soil fertility and fertilizersJohn Havlin, John L. Havlin, Samuel L. Tisdale, Werner L. Nelson, James D. Beaton · First published 1956 · Latest edition 2014Open the Tome
