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![](./images/clear.gif) 1.- ABNORMAL PERTURBATIONS IN THE F2 REGION IONOSPHERE OBSERVED PRIOR TO THE GREAT SAN JUAN EARTHQUAKE OF 23 NOVEMBER 1977
ELSEVIER; OXFORD-NEW YORK; III; INTERNATIONAL, 2004
MONITORING OF CHANGES RELATED TO NATURAL AND MANMADE HAZARDS USING SPACE TECHNOLOGY
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