TY  - BOOK
AU  - Pallas,Norvin
TI  - Code games
PY  - 1973///)
CY  - New York
PB  - Sterling. London & Sydney: Oak Tree Press
UR  - http://www.archive.org/details/codegames00pall
UR  - http://www.openlibrary.org/books/OL24611461M
ER  -