TY  - RPRT
TI  - Sources and uses of fertilizers and other soil amendments for food production; an outline
AU  - Hansford Threlkeld Shacklette
AU  - R. C. Severson
PY  - 1975
DO  - 10.3133/ofr7523
UR  - https://pubs.usgs.gov/publication/ofr7523
ID  - ofr7523
ER  -