Warren J. Samuels is Professor Emeritus of Economics at Michigan State University, where he taught from 1968 to 1998. He previously served on the faculties of the University of Missouri, Georgia State University, and the University of Miami. One of the most prolific historians of economic thought, with cognate interests in the philosophy of economics, public finance, and law and economics, he has been president of the History of Economics Society and the Association for Social Economics. Professor Samuels was awarded the Kondratieff Medal by the Kondratieff Foundation of Moscow. He is the author of more than ten books and the editor of several dozen titles, as well as more than seventy volumes in the series Research in the History of Economic Thought and Methodology and Recent Economic Thought, as well as for the Journal of Economic Issues. He received his PhD from the University of Wisconsin. Marianne F. Johnson is Professor of Economics at the University of Wisconsin, Oshkosh. She is co-editor of the series Research in the History of Economic Thought and Methodology and has co-edited two multi-volume projects on early American economic thought. William H. Perry is a professional lexicographer with more than thirty years experience in constructing and searching large evidentiary and documentary research databases for special projects. For this work, Mr Perry constructed a database containing, in machine-readable format, all significant philosophical, religious, scientific, political, and economic primary and secondary sources from the beginnings of Western and Middle Eastern civilization until the end of the nineteenth century, searchable by concept.