If you want to know more about this author and the complete collection of his books asks a free document titled Plan of Studies of Atkinson' Work at: http://www.ramacharaca.com.br.
All of Yogi Ramacharaka's works can also be obtained at Kessinger Publishing's Rare Reprints: http://www.kessinger.net
Unsourced material must go. edit
The bit about "one person" doing research into the mystery of the Yogi is so far beneath Wiki standards that i would like to delete it immediately. But i am mentioning it here, in order to give whoever wrote it a chance to source and document it before i remove it.