The most important factor in the development of Caucasian studies is expanding source base through use archival material, methods analysis and its processing. Today, careful detailed study new documents helps to make corrections sheds light on a number questions about history region that have been overlooked by researchers. In this connection, materials collected from archives Russian State Arc...

SSSAJ: Volume 75: Number 5 • September–October 2011 Trade or manufacturers’ names mentioned here are for information only and do not constitute endorsement, recommendation, or exclusion by the USDA-ARS. Soil Sci. Soc. Am. J. 75:1712–1722 Posted online 4 Aug. 2011 doi:10.2136/sssaj2010.0355 Received 16 Sept. 2010. *Corresponding author ([email protected]). © Soil Science Society of America...