TY  - BOOK
AU  - Smirnov,V.
AU  - Troitsky,Anatoly
TI  - Boring practice
U1  - 621.945 
PY  - 1967///
CY  - Moscow
PB  - MIR Pub
KW  - Boring
KW  - Hydraulic engineering
KW  - Boring machinery
ER  -