Long term stability study at FNAL and SLAC using BINP developed hydrostatic level system by Seryi, A, Ruland, R, Shiltsev, V, Lach, J, Plant, D, Chupyra, A, Erokhin, A, Kondaurov, M, Medvedko, A, Parkhomchuk, V, Shubin, E, Singatulin, S, Kuznetsov, A

Hydrostatic level system for slow ground motion studies at Fermilab and SLAC by Seryi, A, Ruland, R, Baklakov, B, Chupyra, A, Erokhin, A, Kondaurov, M, Medvedko, A, Parkhomchuk, V, Singatulin, S, Shubin, E, Lach, J, Plant, D, Shiltsev, V