TY  - RPRT
TI  - Recommended technical provisions for construction practice in shoring and sloping of trenches and excavations 
AU  - Yokel, Felix Y
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS BSS 127
DO  - 10.6028/NBS.BSS.127
ER  -