Happily we have recently (in the last 12 years) seen lots of new material on Jack Parsons. There is the book "Strange Angel" by George Pendel (2006 (!)) which was just turned into a CBS series (CBS All Access, accessible through Amazon Prime) by the same name.

Several clips of the TV series are available on YouTube as well as at least one interview with author George Pendel.

I also found Parson's reports on his Babalon Working online at the Hermetic Library.

It looks like we are living in a kind of Jack Parsons Renaissance.