TY JOUR TI HISTORICAL AND CULTURAL PRECONDITIONS FOR THE DEVELOPMENT OF THE CAUCASIAN MINERAL WATERS KW historical stages of resort development KW tourism KW region KW mineral waters KW sanatoriums KW the Caucasian Mineral Waters KW the potential of federal resorts JO Service & Tourism: Current Challenges AU Oborin, M.S. AU KOZHUSHKINA, I.V. PY 2017 IS 11 PB Russian State University of Tourism and Service