Williams, William Appleman. The contours of American history. [electronic resource] - [1st ed.]. - Cleveland, World Pub. Co. [1961] - 513 p. 22 cm. Includes bibliographical references. LCCN: 61005811 Subjects--Geographic Terms: United States--History--Philosophy. LC Class. No.: E175.9 / .W5 Dewey Class. No.: 973.01