Before the "Enigma" was broken.... Polish radio intelligence during the war with Bolshevik Russia 1918-1920.
T. 1-2. Warsaw 2004, 2010. OW Rytm; ISP PAN, Museum of Józef Piłsudzki in Sulejówek, National Cultural Center, OW Rytm. 8 large, pp. 1054, [10]; 1405, [2], illustrations, hardcover, varnish. Own signatures. Condition b. good.
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