Book reviews in this article:CENTRAL–EASTERN EUROPE: CRUCIBLE OF WORLD WARS. By Joseph S . Roucek and Associates. (New York: Prentice‐Hall. 1946. Pp. xii, 679. $5.00.)EUROPE 1492 TO 1815. A Social, Cultural, and Political Study. By Chester Penn Higby. (Philadelphia: J. B. Lippincott Company. 1948. Pp. xiv. 658. $5.00.)A HISTORY OF EUROPE SINCE 1870. By Sidney H. Zebel. (Philadelphia: J. B. Lippincott Company. 1948. Pp. x, 992, lxix. $5.00.)FREDERICK THE GREAT: THE RULER, THE WRITER, THE MAN. By G. P. Gooch. (New York: Alfred A. Knopf, 1947. Pp. ix, 376. $5 .4ATLANTIC FRONTIER: COLONIAL AMERICAN CIVILIZATION. By Louis B . Wright (New York: Alfred A. Knopf. 1947. Pp. xi, 354. $3.