try Sardar Bhim Bahadur Pandey's "tyas bakhat ko Nepal".. another would be to look at, although it might not have a lot on policy stuff is, "With a King in the Clouds" by Erica leuchtag. I have only read Bhim Bahadur Pandey's 4 volume book. You got to be specific.. aba k policy, kasko policy khojeko.. koon period ko.. then it will be easier for us to be of your assistance.