A brief report by the astronomer Constantine between.Institute of Yves.Iveronova on trips with a pendulum in the Moscow province...

A brief report by the astronomer Constantine between.Institute of Yves.Iveronova on trips with a pendulum in the Moscow province in 1893.- 1893. -Agreement No. 24 of 02/12/2016 Grade 22 manuscript of the works of members of the Russian Geographical Society and individual documents in the Moscow province, case 31..Electronic copy source: PB