Essential elements and soil amendments for plants :
sources and use for agriculture /
by R.C. Severson and Hansford T. Shacklette.

APA Citation

Severson, R. C. (Ronald Charles)., Shacklette, H. T., Geological Survey (U.S.). (1988). Essential elements and soil amendments for plants: sources and use for agriculture. [Washington, D.C.]: U.S. G.P.O. .

MLA Citation

Severson, R. C. (Ronald Charles), 1945-, Hansford T Shacklette, and Geological Survey (U.S.). Essential Elements And Soil Amendments for Plants: Sources And Use for Agriculture. [Washington, D.C.]: U.S. G.P.O. , 1988.

Warning: These citations may not always be complete (especially for serials).