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The extended range 7 elements (ER7) seismic array, ILPA, has been installed in Iran. Construction was started in the winter of 1973 as a joint undertaking of the governments of Iran and the United States of America. This array began its operation in January 1976.
Teledyne-Geotech: Operation and maintenance manual, short period filter, model 38850, 15 September 1975
Teledyne-Geotech: Operation and maintenance manual, long period filter model 38840, 15 September 1974
Texas instruments incorporated: Technical manual, operation and maintenance instructions, ER7 seismic system, 14-08-0001-14031 1 August 1975
Texas Instruments Incorporated: model 980A computer maintenance manual. System description, Volome 1, Manual 980699-9701, Jan., 1973