He also used symbols available to a typesetter which are unavailable to us in ASCII (plain vanilla text) to illustrate bird calls and notes. I have replaced these with a description of what was there originally.
Finally, he used italics throughout the book that I was unable to retain, because of the ASCII format. The two uses of the italics were to denote scientific names and to emphasize. I have done nothing to note where the italics were used, as I don't think it really has a great affect on reading this book.]