Multi-Epoch GNSS Campaigns of the National Geodetic Network in Estonia by J. Metsar, K. Kollo, A. Ellmann, A. Rüdja and P. Pihlak J. Metsar, K. Kollo, A. Ellmann, A. Rüdja and P. Pihlak FULL-TEXT PDF Vol. 54, No. 1, 2019