TY - RPRT TI - Introduction to field methods for hydrologic and environmental studies AU - Robert R. Holmes AU - P. J. Terrio AU - M.A. Harris AU - P. C. Mills PY - 2001 DO - 10.3133/ofr0150 UR - https://pubs.usgs.gov/publication/ofr0150 ID - ofr0150 ER -