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Figure 1.  Sintashta-Petrovka areotectonics (graphic reconstruction). (A) the 1st degree of fortification complexity. (B) the 2nd degree of fortification complexity. (C) the 3rd degree of fortification complexity.

Figure 1 Sintashta-Petrovka areotectonics (graphic reconstruction). (A) the 1st degree of fortification complexity. (B) the 2nd degree of fortification complexity. (C) the 3rd degree of fortification complexity.