STRUCTURE AND CONTENT OF E-LEARNING INFORMATION ENVIRONMENT BASED ON GEO-INFORMATION TECHNOLOGIES ArticleLevina E.Y., Masalimova A.R., Kryukova N.I., Grebennikov V.V., Marchuk N.N., Shirev D.A., Renglikh K.A., Shagieva R.V.Eurasia Journal of Mathematics, Science and Technology Education. Vol. 13. 2017. P.. 5019-5031