Many university horticulture libraries have a copy. If you find one, you can often use their book scanner to create a personal reference PDF (for your own use—not distribution). This is a legal grey area but generally accepted as "fair use" for research.
Species-specific notes
Until then, remember what John Naka said: "The tree does not grow fast, so you must think slow." Don't rush the search for the PDF. The wisdom of the master is meant to unfold slowly, one branch at a time. John Naka Bonsai Techniques 1 Pdf
A method for arranging branches to create depth and structure. Many university horticulture libraries have a copy