TY  - RPRT
TI  - In situ determination of particle friction angles of fluvial gravels
AU  - Christopher E. Johnston
AU  - E.D. Andrews
AU  - John Pitlick
PY  - 1998
DO  - 10.1029/98wr00312
UR  - https://pubs.usgs.gov/publication/70020811
ID  - 70020811
ER  -