TY  - RPRT
TI  - Apparatus and technique for multiple tests by the confined-spot method of colorimetric analysis: Application to field estimation of nickel and copper
AU  - J. H. McCarthy
AU  - R.E. Stevens
PY  - 1958
DO  - 10.1021/ac60136a026
UR  - https://pubs.usgs.gov/publication/70010451
ID  - 70010451
ER  -