TY  - RPRT
TI  - Instream flow assessment and economic valuation: a survey of nonmarket benefits research
AU  - Aaron J. Douglas
AU  - Richard L. Johnson
PY  - 1993
DO  - 10.1080/00207239308710816
UR  - https://pubs.usgs.gov/publication/70128769
ID  - 70128769
ER  -