TY  - RPRT
TI  - Development and calibration of a pressure-difference bedload sampler
AU  - Edward J. Helley
AU  - Winchell Smith
PY  - 1971
DO  - 10.3133/ofr73108
UR  - https://pubs.usgs.gov/publication/ofr73108
ID  - ofr73108
ER  -