TY  - RPRT
TI  - A plane-type soil sampler
AU  - Paul J. Frey
PY  - 1963
DO  - 10.1577/1548-8659(1963)25[46:apss]2.0.co;2
UR  - https://pubs.usgs.gov/publication/70171209
ID  - 70171209
ER  -