Plans and cuts of the Loor Caves (the city of Ilet Orenburg province).Temperature graphs in caves and temperature tables by mont...

Plans and cuts of the Loor Caves (the city of Ilet Orenburg province).Temperature graphs in caves and temperature tables by months.- 1881. -Agreement No. 24 of 02/12/2016 category 26 of the manuscript of the works of members of the Russian Geographical Society and separate documents on the Orenburg province, case 33..Electronic copy source: PB