… Arupjyoti Saikia lectures on environmental history of the Brahmaputra River … Arupjyoti Saikia lectures … at IIT Guwahati, on September 27 as a speaker in its fall colloquium series. Professor Saikia is a leading scholar on … Ahom Dynasty, various empires, kingdoms, and governments—local, regional or colonial—aimed to harness the large …