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“Record and Analysis of the Spanish Negative Landings”, Flying Saucer Review, Vol, 18:4, July-August 1972
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A Catalogue of 200 Type-I UFO Events in Spain and Portugal, Center for UFO Studies, April 1976; “Are UFO Sightings Related to Population?”, in Proceedings of the 1976 CUFOS Conference, Center for UFO Studies, May 1976
“Dramatic Chase in Spain”, in The Encyclopedia of UFOs, Ronald Story, 1980
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“The Spanish Air Force UFO Files”, International UFO Reporter, January-February 1993
“Spanish Air Force UFO Files: The Secret´s End”, in MUFON 1993 International UFO Symposium Proceedings, MUFON, July 1993
“Alleged Experiences Inside UFOs”, Journal of Scientific Exploration, Vol. 8:1, 1994: “Ballester-Guasp Evaluation of Completed Reports” (Jerold Johnson) in MUFON Field Investigator´s Manual, MUFON, February 1995
“UFO Declassification in Spain”, in UFOs: Examining the Evidence, Mike Wootten (ed), BUFORA, August 1995
“Declassification! Military UFO Records Released: The Spanish Experience”, in UFO 1947-1997. Fifty Years of Flying Saucers, H. Evans and D. Stacy (eds), John Brown, May 1997
“Monitoring Air Force Intelligence”, in MUFON 1997 International UFO Symposium Proceedings, MUFON, July 1997
“UFO Declassification - The Spanish Model”, European Journal of UFO and Abduction Studies, launch volume, September 1999.



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