TY  - BOOK
AU  - Hewett, B H M.
AU  - Johannesson, S.
TI  - Shield and compressed air tunneling
U1  - 624.152 
PY  - 1922///
CY  - New York
PB  - McGraw Hill Book Company
KW  - Tunnel Engineering
KW  - Tunnel Construction Methods
KW  - Underground Construction
N1  - Includes bibliographical references and index
ER  -