TY  - RPRT
TI  - Compilation of historical water-quality data for selected springs in Texas, by ecoregion
AU  - Franklin T. Heitmuller
AU  - Iona P. Williams
PY  - 2006
DO  - 10.3133/ds230
UR  - https://pubs.usgs.gov/publication/ds230
ID  - ds230
ER  -