Coast to Coast AM with Art Bell. First interview with "Mad Man" Marcum on building a time machine. 04/18/1995
Second interview - Coast to Coast 07/30/1996 - https://odysee.com/1996-07-30---Coast-to-Coast-AM-with-Art-Bell-----%27Mad-Man%27-Marcum---Time-Travels:af2bf263ae68ceba1b315d31afd0e72433f2b891?r=3mpiXwTb1XwgxgxoZy1L5bogC2RB1iWH
Third Interview - Midnight in the Desert 09/04/2015 - https://odysee.com/@ArtBellFan:3/art-bell-mitd-mad-man-markum-time-traveler:c?r=3mpiXwTb1XwgxgxoZy1L5bogC2RB1iWH