cross breading, developing ya own type of weed..

so i keep coming up w/ different types of plants to mix but somebody allready got to it..

is there a book i can buy or download (E-Book) or a websight, that shows all the diff combinations.. my friend was tellin me that he has a book that shows all that stuff.. and i wanna know so i dont waste my time trying to make a new strain when its allready done before..

ya that sounds interseting someone plz find this out