VALACH, F., VÁCZYOVÁ, M., VÝBERČI, D. and KOČI, E. 2024. Regular observations of the geomagnetic field at the Ógyalla observatory (present-day Hurbanovo) near the turn of the 20th century, including magnetic storms accompanied by auroras in March 1894, September 1898, and October 1903. Contributions to Geophysics and Geodesy. 54, 1 (Apr. 2024), 23-48. DOI:https://doi.org/10.31577/congeo.2024.54.1.2.