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обратная геодезическая засечкаcontraintes
arpent. Snellius–Pothenot problem (MichaelBurov); Snellius problem (MichaelBurov); Snellius – Pothenot Surveying Problem (MichaelBurov); back-sight (MichaelBurov); back sight (MichaelBurov); backsight (MichaelBurov)