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The possibilities of using gravimetric data obtained from global geopotential models (GGM) for the territory of Bulgaria in the processing of precise levelling measurements for the determination of normal differences and geopotential differences are presented in the article. The researches were carried out on first order levelling lines of the State Levelling Network of the Republic of Bulgaria, situated in different topographic conditions, as well as in conditions of different anomalous gravitational field. The d...