H istorians are, by definition, interdisciplinary-they study events not only from diplomatic and military records, but also from social, economic, and intellectual or literary evidence. A researcher who restricts himself to a single source is ahistorical in today's context. The modern researcher is faced not only with the problem of mastering sources in a multiplicity of fields, but also with mastering the structure of the records in which the documentary evidence is imbedded. For true historical perspective on any modern issue, all of the interlocking agency relationships of a vast and paternalistic government must be understood and probed. There is not a subject relating to American national development that can be studied and understood from only one source-from one man's private papers, from one series of newspapers, or from one agency's records. It is fair to ask how today's young historians master these sources in their approach to universal history. Evidence is that they do not. The young scholar avoids general history and takes the route of monographic literature to fleeting fame and fortune. He writes an incident in a single man's career from one collection of personal papers supported by peripheral secondary works. He retreats to an antithetical and intricate analysis of a minute subject, such as the voting record in Chicago's 5th Ward in the 1928 election. The modern, young historian has assumed the position of bricklayer instead of architect of history-he is losing the ability to design new, graceful, lofty arches which bridge the spaces of time. His excuses for this approach are contradictory-on the one hand, the paperwork explosion has made great study and analysis of events impossible or, on the other hand, the advent of the telephone and rapid transportation which can bring people into direct contact has resulted in a lack of documentation of the genesis of historical events. One is confirmed in the view of the young historian as a limited researcher by daily scanning of the registrations at a great repository of documents, such as the Manuscript Division of the Library of Congress or the search room of the National Archives: "Southern Reporting of the Civil War," "The Freedman's Bureau in Maryland," "Roosevelt and the Trusts," "The Republican Opposition to Article Ten," "Allied Intervention in Russia, 1918-1919," and onward from peak to peak of American political life. The titles, with minor variations, appear and reappear, and the papers of Thomas Jefferson, Elbridge Gerry, the American Colonization Society, Thomas Ewing, and occasionally Gifford Pinchot are removed from the shelves, poured over, noted, and returned. Their use,