If you are tired of searching for out-of-print books, despair not! Kessinger Publishing offers reprints of an outstanding array of books. The prices are relatively reasonable.
Some other important books:
The Mystery of the Serpent Mound: In Search of the Alphabet of the GodsPrivately published by Ross Hamilton . One of the primary goals of the book is to prove an American connection to a pre-Egyptian cult or culture which designed and (likely) constructed the original version of the Great Serpent Mound.
Here are some graphic samples of Ross's work:
Python of Pythagoras and Summer Solstice
God's Secret Formula:
Deciphering the Riddle of the Universe
and the Prime Number Code
by Peter Plichta
The Geometry of Meaning by Arthur Young. See Books link on left for review of another of Arthur's books.
A Pythagorean Sourcebook and Library by K.
S. Guthrie
Forbidden Archeology: The Hidden
History of the Human Race
by Michael A. Cremo and Richard
L. Thompson Read some Reviews.
You can also check out an abridged version: The Hidden History of the Human Race
A mathematician's sceptical take: Numerology or What Hath Pythagoras Wrought
The Power of Limits by Gyorgy Doczi
Sacred Architecture by A. T. Mann
Islamic Patterns by Keith Critchlow
The Myth of Invariance by Ernest G. McClain
The Pythagorean Plato by Ernest G. McClain
Theoretic Arithmetic of the Pythagoreans by Thomas Taylor
Sacred Science by R. A. Schwaller de Lubicz
The Temple of Man by R. A. Schwaller de Lubicz (2 volumes)
The Meaning of Shakespeare by Harold C. Goddard
Less Than Words Can Say by Richard
Mitchell (Full book available online.)