This academic journal series is published by the Center for Modern Henan and China Studies at Zhengzhou University, a key humanities and social sciences research base in Henan Province. It primarily publishes outstanding scholarship in the field of modern Chinese history. This is Volume 9, featuring articles including “A Study of the Interactions Between Logic and Knowledge in Modern China,” “Food Begins with the Teeth: The Production and Promotion of Domestic Dental Products in Modern China,” “Early Copper-Iron Composite Implements and the Collision of Ancient Chinese and Western Metallurgical Technologies,” “Innovative Approaches and the Mining of Historical Sources: A Review and Outlook on Research into Modern Police Forces,” and “Social Mobilization in the Early People’s Republic of China’s ‘Plant Trees and Reforest the Nation’ Campaign,” among others.