Instruct: Classify the given review into positive or negative sentiment.
Query: From the rear cover

A RESEARCH GUIDE TO CENTRAL PARTY AND GOVERNMENT MEETINGS IN CHINA, 1949-1975.". . . an important contribution to the field. I believe, in fact, it will be an indispensable aid for future research on national level politics and policy making in China. Not only will the data [Kenneth Lieberthal] presents on central party and government meetings be of enormous help in the study of particular policies; it provides a basis for new analysis of the policy process in China."--A. Doak Barnett.