Relatively small climate fluctuations, such as the warming period that was observed in recent decades, occur over periods of tens and hundreds of years, and are

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the N

In this book, Volodymyr Koloda and Serhiy Gorbanenko discuss the important role of agriculture in the socio-economic development of the Khazar Khaganate and its