Here you can listen to the digitized cassette box Dr Puharich made available in 1982 containing 8 tapes audio recording of him lecturing on the subject :

“The Future of Humanity, and what You can Do about It”

Cassette 1 ............00:59:20 min

Cassette 2 ............01:01:15 min

Cassette 3 ............00:59:18 min

Cassette 4 ............01:00:37.min

Cassette 5 ............01:01:06 min

Cassette 6 ............01:02:47 min

Cassette 7 ............01:04:21 min

Cassette 8 ............00:11:08 min

The tapes are old , the original recordings where not so great
so the quality is sometimes pretty bad. Sorry about this.