| http://www.w3.org/ns/prov#value | - entation and multiple witnesses both on the ground and in the air. ??? There are more than 4000 landing trace cases from around the world. ??? There are hundreds of electromagnetic cases where spacecraft have been observed by police, military personnel and civilians to affect car engines, radios and other electric devices. ??? There are more than 100 first- and second- hand witnesses to the retrie
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