TY  - RPRT
TI  - Helical probe tests for shallow soil exploration 
AU  - Yokel, Felix Y
AU  - Mayne, Paul W
PY  - 1986
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 86-3351
DO  - 10.6028/NBS.IR.86-3351
ER  -