Analysis of Flying Object Incidents in the United States, 1948

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b. A high rate of climb as well as the apparent ability to remain motionless or hover for a considerable length of time is indicated.

c. Reported sizes have varied from that of a 25-cent piece to 250 feet in diameter, and from the size of a pursuit plane to the bulk of six B-29 airplanes.

d. Speeds have been estimated throughout the entire range from very slow or hovering to supersonic.

e. Sounds and visual trails are not normally associated with the sightings.

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