1. Advanced National Seismic System (ANSS): 2003, Composite Earthquake Catalog (http://quake.geo.berkeley.edu/cnss/)
2. Intensity-attenuation and magnitude-intensity relationships for northwest european earthquakes
3. Moment Magnitudes for Early (1923-1961) Instrumental Iberian Earthquakes
4. Center for International Earth Science Information Network (CIESIN); International Food Policy Research Institute (IFPRI); and World Resources Institute (WRI): 2000, Gridded Population of the World (GPW), Version 2, CIESIN, Columbia University, Palisades, New York (http://sedac.ciesin.columbia.edu/plue/gpw).