The list author says: "Dwapara Yuga can be characterized as a breakdown of the idea of a material world and a growing consciousness of the underlying unity of peoples, energy and nature. Here is a short list of books that is by no means exhaustive. There are hundreds of books around Yogananda and Kriya but only a handful that touch more than passingly on the concepts of Dwapara Yuga. Please shop around for the more obscure titles. Some folks have for $10 where others have for $100+ ridiculous prices."