http://mysteriousuniverse.org/2012/04/the-betz-mystery-sphere-alien-artifact-or-doomsday-device/ http://news.google.com/newspapers?id=qupRAAAAIBAJ&sjid=NnMDAAAAIBAJ&pg=7196%2C1258980 http://news.google.com/newspapers?nid=2245&dat=19740415&id=0nwzAAAAIBAJ&sjid=KTIHAAAAIBAJ&pg=6841,4157030