How to mask the trench in winter

How to disguise the trench in the winter: a memo for a fighter and younger commander / ch.Military.Ex.Red Army.- Moscow: Military.Publishing House of Nar.Commissariat of Defense of the USSR, 1942. -16 p.: silt .. -On the region: Military Publishing House of the NPO of the USSR..I. RSFSR.The main military engineering department of the Red Army. 1.People (collection).Electronic copy source: PBOriginal storage location: RSG