TY  - BOOK
AU  - Haldane,R.A.
TI  - The hidden world
SN  - 0709153511 :
U1  - 001.543609 
PY  - 1976///
CY  - London
PB  - R. Hale
KW  - Cryptography
KW  - History
N1  - Includes index
ER  -