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The NSA holds a large collection (well over 100,000) of original seismograms from many observatories and a microfilming project is complete. A full report has been produced on the UK historical seismogram holdings, including details of UK seismlogical bulletins held in the archive (PHO Henni, JH Lovell & KIG Lawrie 1999, UK Historical Seismograms held in the National Seismological Archive (NSA), British Geological Survey Technical Report WL/99/21 , Global Seismology Series).

WL/99/21 UK Historical Seismograms and Bulletins held in the NSA. (Currently in Final Draft) NSA holdings of over 100,000 UK historical seismograms and several hundred bulletins are presented in a format that allows researchers to ascertain what complementary material exists.