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This text explores the natural history of Texas and more than 2900 springs in 183 Texas counties. It also includes an in-depth discussion of the general characteristics of springs - their physical and prehistoric settings, their historical significance, and their associated flora and fauna.
U.S. Army aviation expanded dramatically in both size and breadth of activities after its inception in 1942, but much of its post-World War II history, particularly after the establishment of the Air Force as an independent service by the national Security Act of 1947, has been relatively neglected. Despite a certain amount of jockeying for position by both services, particularly in the early years after their separation, the Army was able to carve out a clear transport and operational combat role for its own air arm. "A History of Army Aviation - 1950-1962" examines the development of the Army's air wing, especially for air support of ground troops, both in terms of organization and in relation to the ongoing friction with the Air Force. After describing the rapid expansion of purely Army air power after 1950 and the accompanying expansion of aviation training, the book delves into the reorganization of aviation activities within a Directorate of Army Aviation. It also provides a valuable account of the successful development of aircraft armament, perhaps the most significant advance of this period. In particular, intensive experimentation at the Army Aviation School led to several practical weapons systems and helped to prove that weapons could be fired from rotary aircraft. This arming of the helicopter was to have a profound effect on both Army organization and combat doctrine, culminating in official approval of the armed helicopter by the Department of the Army in 1960. "A History of Army Aviation - 1950-1962" also explores the development of new aircraft between 1955 and 1962, including the UH-1 medical evacuation, transport, and gunship helicopter and the HC-1 cargo copter. In addition, the book discusses the Berlin Crisis of 1961 as an impetus for immediate and unexpected expansion of army aviation, quickly followed by the beginnings of intervention in Vietnam by the end of 1962.
"This book is the result of a study in which the authors identified all of the American women who earned PhD's in mathematics before 1940, and collected extensive biographical and bibliographical information about each of them. By reconstructing as complete a picture as possible of this group of women, Green and LaDuke reveal insights into the larger scientific and cultural communities in which they lived and worked." "The book contains an extended introductory essay, as well as biographical entries for each of the 228 women in the study. The authors examine family backgrounds, education, careers, and other professional activities. They show that there were many more women earning PhD's in mathematics before 1940 than is commonly thought." "The material will be of interest to researchers, teachers, and students in mathematics, history of mathematics, history of science, women's studies, and sociology."--BOOK JACKET.