Estimation and use materials of the airily-depressed surveys on the coal mines of UkraineTetiana Bunko, Maksym Shyshov, Vadym Myroshnychenko, Ivan Kokoulin and Mykhailo DudnykE3S Web Conf., 109 (2019) 00013DOI: https://doi.org/10.1051/e3sconf/201910900013