Book reviewed in this article:Proceedings of the Twelfth International Conference of Agricultural Economists. By THE INSTITUTE OF AGRARIAN AFFAIRSIsolated State. By JOHANN HEINRICH VON THÜNEN. Translated by Carla M. WartenbergLand Use Information. A critical survey of U.S. Statistics including possibilities for greater uniformity. By MARION CLAWSON with CHARLES L. STEWARTAn Agricultural Geography of Great Britain. By D. W. GILCHRIST SHIRLAWGeography of Population. By J. BEAUJEU‐GARNIERThe Unification of the World: Proposals of a Diplomatist. By PAUL DE HEVESYEstate Villages. A Historical Study of the Berkshire Villages of Ardington and Lockinge. By M. A. HAVINDEN with D. S. THORNTON and P. D. WOODThe Economy of the Israeli Kibbutz. By ELIYAHU KANOVSKY. Harvard Middle Eastern Monographs XIIIGoverning Soil Conservation: Thirty Years of the New Decentralization. By ROBERT J. MORGANStudies in Utilization of Agricultural Land. By D. S. CHAUHANLand Reclamation in Kerala. By V. R. PILLAI and P. G. K. PANIKARThe Indian Rural Problem. By SIR MANILAL B. NANAVATI and SHRI J. J. ANJARIAThe Role of Agriculture, in Economic Development. A Case Study of Pakistan. By MAHMOOD HASAN KHANAgriculture and Nigerian Economic Development. By H. A. OLUWASANMIFood and Agriculture in Communist China. By J. LOSSING BUCK, OWEN L. DAWSON and YUAN‐LI WUThe Production and Marketing of Pigs. Third Edition. By H. R. DAVIDSONLes Facteurs d'Evolution de la Commercialisation des Produits Agricoles en France. By HUBERT ROUSSEAUAvenir de l'Economie Fruitière. Tome 1. Produire et Vendre. By P. MAINIÉPolitique de Financement et Choix des Investissements. By P. MAINIÉ, B. VILLAIN and J.