Petrov N. More about the insidious techniques of foreign intelligence. In Russian /Petrov N. Eshche o kovarnykh priemakh inostrannoy razvedki. Moscow. Partizdat of the Central Committee of the All-Union Communist Party (b). 1937. 16 p. Please contact us for details on condition of available copies of the book. SKUalbda241e2cb36c132b