Professor Postan's work on the social and economic history of the Middle Ages has had an enormous influence upon the study of medieval history and upon the development of the subject. His essays represent his major contribution and are a unique and valuable addition to the literature. Twenty-two essays are gathered together into two volumes: Essays on Medieval Agriculture and General Problems of the Medieval Economy and Medieval Trade and Finance. Previously published elsewhere, frequently in obscure places, over a period from 1928 to 1972, they are still used today by students and scholars in all branches of medieval and economic history as well as by social scientists and economists more generally.