Presented at: First MedCLIVAR Workshop on Reconstruction of Past Mediterranean Climate.The Ebro Observatory was founded by the Jesuits in 1904 in Roquetes, Tarragona, near the Jesuit Faculty of Philosophy and Theology in Jesús, Tortosa and near the Ebro Delta (NE Spain). Since then it has been active in the fields of Geomagnetism, Solar Physics, Electricity, Meteorology and Seismology. It was part of the very active network of Geophysical observatories run by the Jesuits, which included more than 70 centres operating between 1814 and 2000 all over the world. One of the main activities of this network was an active interchange of meteorological and climatological data. Currently the library of the Ebro observatory keeps an abundant collection of the reports and publications from Jesuits and other observatories for the 19th and 20th centuries. Due to funding shortage the library is not completely catalogued yet and its holdings are not digitised, which hampers an easy access to the data. We show a sample of the data kept in the Ebro library, with emphasis on high resolution (daily and sub-daily) weather observations from the early 20th century in the Balkans and Egypt.Peer reviewed