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This web page states the following, "The electronic version is available for free only for registered." We saw that the web site stated " If you are already registered, you may log in here." It also said " Publications of the Institute of Geophysics, Polish Academy of Sciences is an editorial series published since 1962, initially until 1970 entitled Materiały i Prace Instytutu Geofizyki PAN. At present it contains the following subject series. A - Physics of the Earths Interior. D - Physics of the Atmosphere. E - Hydrology formerly Water Resources." The header had journal as the highest ranking optimized keyword. It is followed by seismology and publications which isn't as ranked as highly as journal.