TY  - RPRT
TI  - The authors respond (Response to Roberts and Frimpong)
AU  - Martha E. Mather
AU  - Donna L. Parrish
AU  - John M. Dettmers
PY  - 2009
UR  - https://pubs.usgs.gov/publication/70193243
ID  - 70193243
ER  -