TY  - BOOK
AU  - Witt ,P.J.
ED  - Symposium on Concrete Shell Roof Construction , 
TI  - Proceedings.
AV  - TH2416 .S95 1952
PY  - 1954///
CY  - London : 
PB  - Cement and Concrete Association , 
KW  - Roofs , Shell
N1  - Bibliography: p. 229-246
ER  -