Theosophy

 Isis Unveiled
by Helena P. Blavatsky [1877]

 The Secret Doctrine
by Helena P. Blavatsky [1888]

 Clairvoyance
by Charles Webster Leadbeater [1899] A Theosophical manual of remote viewing in space and time.

 A Textbook of Theosophy
by C.W. Leadbeater [1912]

 Theosophy
by Rudolf Steiner, tr. by Elizabeth Douglas Shields [1910] The tripartate human, reincarnation, higher planes of existence, auras, and more.

External Links

Theosophical University Press Online — The Theosophical Society has put most of its catalog online, including many books still under copyright.
AnandGholap.net — A large selection of public domain etexts of the writings of the major Theosophists.