The problems of Belgium’s frontiers are not covered in any single book. The Belgian point of view will be found in P. Nothomb, _La barrière belge_ (Paris, 1916); one chapter also as _Histoire belge du grand duché de Luxembourg_ (Paris, 1918). See also E. Bourgeois, _La frontière orientale du royaume de Belgique_, in _Travaux du Comité d’Etudes_, ii. For Luxemburg in general, see Miss Ruth Putnam, _Luxemburg and her Neighbors_, with bibliography (second edition, New York, 1920). The question of the Scheldt is summarized by A. Rotsaert, _L’Escaut depuis le traité de Munster_ (Brussels and Paris, 1918); numerous documents in Guillaume, _L’Escaut depuis 1830_ (Brussels, 1903). For a Dutch view, see Den Beer Poortugael, _La neutralité sur l’Escaut_ (The Hague, 1911). For this question at Paris, cf. Cammaerts and Geyl in _The New Europe_, July 31 and August 14, 1919. On Belgian neutrality and the treaties of 1839, see F. L. Warrin, Jr., _The Neutrality of Belgium_ (Washington, 1918). The history of Belgium’s frontiers can be traced in the following historical atlases: L. van der Essen, _Atlas de géographie historique de la Belgique_ (Brussels and Paris, 1919-), notably Map 10 (1786) by F. L. Ganshof; _Geschiedkundige Atlas van Nederland_ (The Hague, 1912); _Geschichtlicher Atlas der Rheinprovinz_ (Bonn, 1898-), especially the maps of 1789. [Illustration: BELGIUM AND HER NEIGHBORS] FOOTNOTES: [8] Articles 109-114, with official map. [9] Articles 380-386. [10] Article 115. [11] Articles 34-39, with official map. [12] Articles 32, 33. [13] Articles 40, 41. [14] Article 361. [15] Article 9, § 2. III ALSACE-LORRAINE The fate of Alsace-Lorraine was, in general, a problem of the war rather than of the Peace Conference. Nothing had done more, in President Wilson’s phrase, “to unsettle the peace of the world for nearly fifty years”; nothing was more earnestly discussed throughout the World War; nothing was settled more simply and quickly once the war was over. The completeness of the Allied victory and the immediate evacuation of Alsace-Lorraine required by the terms of the armistice left no doubt of the return of the lost provinces to France. The Peace Conference had only to determine certain necessary details. “The territories which were ceded to Germany in accordance with the Preliminaries of Peace signed at Versailles on February 26, 1871, and the Treaty of Frankfort of May 10, 1871, are restored to French sovereignty as from the date of the Armistice of November 11, 1918.” So runs Article 51 of the treaty of Versailles, and the rest follows from that.