Experimental modeling of large diameter holes based on materials of Bronze Age stone axes are made using a copper tube. Experiments on hollow drilling in the expedition of
S. A. Semenov have shown
Manufacturing holes with hollow bone according to the experiments drilling during the expedition of
S. A. Semenov showed the great complexity of this method. The authors
A stage complete? 1937 in the history of Russia: Retrospective reflections studies of Stalin’
s Great Terror during the first fifteen years after the collapse of the Soviet regime