RD 31.20.01-97 Rules of technical maintenance of seaships. Main guidance
РД 31.20.01-97 Правила технической эксплуатации seaships. Главная Руководство
PLEASE CONTACT RUSSIANGOST.COM TO REQUEST YOUR COPY IN RUSSIAN, ENGLISH, GERMAN, ITALIAN, FRENCH, SPANISH, CHINESE, JAPANESE AND OTHER LANGUAGES.