ʼDzam gliṅ rgyas bśad : the earlier (1820) version of the monumental Tibetan geography of the world - ʼJam-dpal-chos-kyi-bstan-ʼdzin-ʼphrin-las, Btsan-po No-mon-han Sprul-sku (Dzongsar Chhentse Labrang, 1981)