TY  - RPRT
TI  - User's manual for QWGRAF, computer programs for water-quality graphics
AU  - J.C. Schornick
AU  - M.C. Place
PY  - 1998
DO  - 10.3133/wri974226
UR  - https://pubs.usgs.gov/publication/wri974226
ID  - wri974226
ER  -