WAR SINCE 1900 (Thames & Hudson, $45), edited by Jeremy Black, not only details the wide range of 20th-century warfare, but also points out the continuities, similarities, and differences that characterize the vast number of armed conflicts of the last one hundred years. From land wars to modern troop deployment, from technological advancement to counterinsurgency, War Since 1900 is an expansive survey of the methodology of war, providing a wealth of time-lines, photographs, maps, and charts, all complemented by inviting, accessible text. This book makes clear that “war might not conform to rules or limits”; its presentation of the facts will make this volume an instant favorite for history buffs.