TY  - RPRT
TI  - Sources of fertilizer minerals in South America; a preliminary study
AU  - James Foster Harrington
AU  - Dwight Edward Ward
AU  - V.E. McKelvey
PY  - 1966
DO  - 10.3133/b1240
UR  - https://pubs.usgs.gov/publication/b1240
ID  - b1240
ER  -