TY  - BOOK
ED  - United States.
ED  - Worcester Polytechnic Institute.
TI  - Shelter design and analysis
T2  - TR-20
U1  - 693.8 
PY  - 1967///
CY  - [Washington]
PB  - Office of Civil Defense
KW  - Nuclear bomb shelters
KW  - MCE
N1  - "(Supersedes TR-20-(Vol. 1) dated June 1965)"; v. 1. Fallout radiation shielding
ER  -