I try to collect all the books on Mystery Hill and I know Brad Olsen's book. I wish there were a dozen more authors like Brad, who can write well and accurately.
Just to list one of our newer members: Brad Olsen of CCC Publishing is looking to network with others here and has all of his books accessible free online. I carry a hard copy with me, check the link online for basic, background material, sometimes intriguing data on sites I am referencing or regions of the world I am wanting to explore. Perhaps it holds true, too, that most "sacred sites" are also "ancient sites" once of great significance to astute wisdomkeepers, astronomers, metrologists and mathematicians...far back into antiquity.
One of Brad's books, _Sacred Places North America_ lists numerous pages for America's Stonehenge (this computer will not pull up the sites, but the accessible online search results for that topic is:
http://books.google.com/books?ie=ISO-8859-1&output=html&id=l4hTCuby90IC&pg=PA333\
&lpg=PA333&sig=ACfU3U0X0qT4v39H0eT0H1tiFUx8-I4SRw&q=america%27s+stonehenge