Awhile back I was doing some research on the breeder Luther Burbank and didn't find much of his writings. Well a few days ago researching something else I came across 100 + of his writing (he seemed to like to write a lot) so if you are interested here's a link to his public domain works (not all but quite a list)
http://archive.org/search.php?query=...iatype%3Atexts