The Deeper Mysteries: Now Available!
This intermediate-length work is actually the third of three works written by Farnsworth over the course of a decade, containing various new age material from a surprisingly large number of sub-topics within the spiritual. It touches on Swedenborg, Blavatsky, levitation, the categorization of spirits and creatures, and many other tidbits. It should be noted that the author was certainly not inclined to editing as a trade since I had to redact dozens of errors in the work, and this was a laymans' sort of guide comprised more of short, discrete sections than one overarching, flowing work.
Some of the content is secondary and comes from Theosophical figures, not just Blavatsky but other "masters" also.