chat doi Sathaban Wichai Chaokhao, Kong Songkhro Chaokhao, Krom Prachasongkhro, Krasuang Mahatthai = Hill tribes, ways of life and development : exhibition of golden anniversary of the Department of Public Welfare at Alliance Francaise, Bangkok, August 15-22, 1991 / organized by Tribal Research Institute, Hilltribe Welfare Division, Department of Public Welfare, Ministry of Interior