PT  - JOURNAL ARTICLE
AU  - James M. Omernik
AU  - Glenn E. Griffith
TI  - Ecological regions versus hydrologic units: Frameworks for managing water quality
DP  - 1991 Sep 01
TA  - Journal of Soil and Water Conservation
PG  - 334--340
VI  - 46
IP  - 5
4099  - http://www.jswconline.org/content/46/5/334.short
4100  - http://www.jswconline.org/content/46/5/334.full