http://thebookofwealth.org/ - The Book of Wealth is the wealth book bible written by Hubert Howe Bancroft in the late 1800's. Until recently, The Book of Wealth was confined to the wealthiest of families and individuals but now it's available as an online book.Whenever, an initial volume of the works comes up on the market at auction, you can guarantee that it sells for tens of thousands of dollars. Believe me, this is not the kind of wealth publication that you can pick up online from Amazon.!
Would it be easier to write a matter on a niche which you comprehend more deeply and write a brief 30 page report that you can sell for a lesser price? -- Or are there high quality Private Label Rights products out there that you sell off immediately and can purchase? -- How about public domain novels? You can send it off to a service to get the book.