Preliminary presentation of accelerogram data from the Guer-rero strong motion accelerograph array. Michoacan - Guerre-ro, México, earthquakes of 19 and 21 september, 1985 / John- G. Anderson... [etal.] 

 - México : UNAM, Instituto de Ingeniería 
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 - Preliminary report; GAA-1A / Instituto de Ingeniería .