Project Gutenberg makes available online and for free some major books whose copyrights have expired.
For some reason Rutherford's "Harp of God" (1921) was considered worthwhile enough to be added to the collection.
Oh well, here is the link:
http://www.gutenberg.net/etext/12868
The HTML version including the book illustrations is at:
http://www.gutenberg.net/dirs/1/2/8/6/12868/12868-h/12868-h.htm
zipped version:
http://www.gutenberg.net/dirs/1/2/8/6/12868/12868-h.zip
--VM44