Makhachkala; Dagestan Book Publishing House, 1972 - 242 pp. The book, written on the materials of geothermal research of the Institute of Physics and the Institute of Geology of the Dagestan branch of the USSR Academy of Sciences, presents the results of studying the thermal regime of the sedimentary strata of Dagestan, which includes a variety of conditions for the occurrence of sedimentary formations .. The range of issues related to the assessment of geotemperature material, experience in conducting geothermal research in shallow wells, methods for assessing the thermophysical characteristics of rocks in their natural occurrence is considered; provides a description of the equipment for undivided measurement of heat flux and its automatic recording; The article highlights the issues of the methodology for conducting thermal exploration of structures by the method of variations of heat flow and gives the main results of its application in the regions of Dagestan and Kalmykia ;. the possibility of predicting earthquakes based on the study of variations in heat flux over time is discussed. When writing the book, modern achievements in the field of geothermia were taken into account .. The book is intended for geologists and geophysicists. Content. Overview of studies of the thermal regime of the earth's crust. A brief geological sketch. Experimental and methodological studies of the thermal regime of near-surface parts of the lithosphere . Methodical features of studying the thermal regime of the sediment cover . Application of geothermal exploration in the search for oil and gas fields