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Blue Book MAXW-PBB14-51-66 (PDF)

NICAP (hosting USAF Project Blue Book documents) · 15 pages · text by GLM-OCR

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An unidentified object was observed at the on radar, and fighters were retooned in for an attempt to identify the unidentified radar return. Fighters were able to see the object, but were not able to get near it because of the altitude of the object. The object is observed in this sighting has positively been identified as a type of upper air research balloon. This object actually consisted of four balloons attached to one "load". A this load weighed approximately 500 pounds, and consisted of metal measuring devices that would give a radar return.

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