 ML Pin spent much of his retirement working on various tributes to King Vajiravudh , who had died while ML Pin was studying in England . In 1970 he began working with a few others with the intent to secure and catalogue the king 's various literary works , some of which by then were at risk of disappearing . He and the group made records of Dusit Thani , obtaining old photographs and other documentation , and organised a " guided tour " of Dusit Thani of old in November that year , which was presented to Princess Bejaratana , among others . 
