Cosmology or Universal Science by Franz Hartmann
Containing the Mysteries of the Universe Regarding God, Nature, Man, the Macrocosm and Microcosm, Eternity and Time Explained According to the Religion of Christ by Means of the Secret Symbols of the Rosicrucians of the Sixteenth and Seventeenth Centuries.
Gnosis of the Mind by G.R.S. Mead
The Key to Theosophy by H.P. Blavatsky
A Clear Exposition in the Form of Question and Answer of the Ethics, Science,
and Philosophy for the Study of Which The Theosophical Society has been Founded.
The Mahatma Letters to A. P. Sinnett
Nightmare Tales by H.P. Blavatsky
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy by H.P. Blavatsky
Volume I: Cosmogenesis
The Secret Doctrine: The Synthesis of Science, Religion, and Philosophy by H.P. Blavatsky
Volume II: Anthropogenesis
Studies in Occultism by H.P. Blavatsky
Theosophy: A Modern Revival of Ancient Wisdom by Alvin Boyd Kuhn