IS:2032 (Pviii)-1965 Geographical symbols used in electro technology
Indian Standard Institution Manak Bhawan
IS:2032 (Pviii)-1965 Geographical symbols used in electro technology - ISI Manak bhawan 1966 - 9
IS:2032 (Pviii)-1965 Geographical symbols used in electro technology - ISI Manak bhawan 1966 - 9