Instruct: Classify Amazon reviews into positive or negative sentiment
Query: From the Back Cover:

David Childs has provided simply the most comprehensive work available in English on the GDR today. His book examines virtually every aspect of the GDR's political, social, economic and intellectual life - from the role of the party to the reilability of its armed forces, from the functioning of its sports "miracle machine" to the structure of its education, from the position of its intellectuals to its treatment of its Christians and Jews. The book is based on a thorough study of West and East German sources, including a wide variety of GDR newspapers and journals, as well as many personal contacts and encounters. Mr. Childs has been acquainted with East Germany for over thirty years and has visited it six times in the last six years.