A method of hiding a message in innocuous looking outgoing letters to USA was devised-all incoming letters were screened for such messages before delivery.
All incoming letters were screened for such messages before delivery. A method of hiding a message in innocuous looking outgoing letters to USA was devised.
A method of hiding a message in innocuous looking outgoing letters to USA was devised. All incoming letters were screened for such messages before delivery.
A method of hiding a message in innocuous looking outgoing letters to USA was devised. All incoming letters were screened for such messages before delivery.