Krasnoznamennaja Ėkspedicija podvodnych rabot osobogo naznačenija (ĖPRON) na Tichom okeane osnovnye napravlenija boevoj podgotovki (1941-1942 gg.) = Red banner special expedition for underwater works (EPRON) in the Pacific Ocean : the main areas of combat training (1941-1942) - Usov, Aleksej Vjačeslavovič ca. 20./21. Jh (2022)