TY  - BOOK
AU  - Tikhonov Engineer I F
TI  - Porous concrete strainers for well-shafts
U1  - 628.114 
PY  - 1956///
CY  - Washington
PB  - National Science Foundation
KW  - Groundwater
KW  - Well-shafts
N1  - Tr. from Russian
ER  -