Introduction: The Disappeaing Frontier?--The Editors * Where Nothing Is as It Seems: Between South China and Mainland Southeast Asia in the "Post-Socialist" Era--Peter Hinton * The Southern Chinese Borders in History--Geoff Wade * Ecology without Borders--Su Yongge * Negotiating Central, Provinicial, and County Policies: Border Trading in South China--Kuah Khun Eng * The Hmong of the Southeast Asia Massif: Their Recent History of Migration--Jean Michaud & Christian Culas * Regional Trade in Northwestern Laos: An Initial Assessment of the Economic Quadrangle--Andrew Walker * Lue across Borders: Pilgrimage and the Muang Sing Reliquary in Northern Laos--Paul T. Cohen * The Transformation of Jinghong, Xishuangbanna, PRC--Grant Evans * The Hell of Good Intentions: Some Preliminary Thoughts on Opium in the Political Ecology of the Trade in Girls and Women--David A. Feingold * Cross-Border Mobility and Social Networks: Akha Caravan Traders--Mike Toyota * Cross-Border Links between Muslims in Yunnan and Northern Thailand: Identity and Economic Networks--Jean Berlie * Trade Activities of the Hoa along the Sino-Vietnamese Border--Dr. Chau Thi Hai * Cross-Border Categories: Ethnic Chinese and the Sino-Vietnamese Border at Mong Cai--Christopher Hutton * Regional Development and Cross-Border Cultural Linkage: The Case of a Vietnamese Community in Guangxi, China--Cheung Siu-woo * Women and Social Change along the Vietnam-Guangxi Border--Xie Guang-mao.