TY  - RPRT
TI  - Visual accumulation tube for size analysis of sands
AU  - B.C. Colby
AU  - R.P. Christensen
PY  - 1956
DO  - 10.1061/jyceaj.0000025
UR  - https://pubs.usgs.gov/publication/70047827
ID  - 70047827
ER  -