TY  - BOOK
AU  - Pequignot.C.A.
TI  - Tunnels &Tunnelling.(1963)
U1  - 25C-492 
PY  - 1971///
PB  - Hutchin Sons Scientefic & Techanical Pub. London.
KW  - CIVI
KW  - C-21
ER  -