It is not complete, as will become apparent. It is also somewhat redundant, indicating that the parts I presume to be from the book by Rife are different drafts, copied willy-nilly into Crane's work. Indeed, it is suspected by several researchers that this is in reality John Crane's writing, based on what Rife told him, and which Rife merely signed as author. In any case its more information, and hopefully Crane submitted a copy of the finished book to the Library of Congress, as he undoubtedly applied for a copyright.

John Crane was an interesting man to my mind. I did not know him well, but from my little experience with him, I found him to be a good and sincere person. I carried on mostly telephonic communication with him over a period of about 2 years. I finally met him shortly before he died, last year in the Veterans Hospital in LaJoya, California, a little north of San Diego. Amongst his last words to me were "We could accomplish so much if we all worked together." I think Rife and John would be very gratified to learn how many people are doing that now in private, truly independent research. If Rife's research can be verified, there is no doubt that it will be due, in part, to the efforts of John Crane.
http://users.navi.net/~rsc/rifebook.htm

Dr. Keith Brewer, a physicist, served for some time in his research career as Chief of the Mass Spectrometer and Isotope section of the National Bureau of Standards (now the National Institute of Standards and Technology, Gaithersburg, MD). Among the studies he conducted beginning in the early 1930s, the examination of the ratio of potassium isotopes 39K/41K in a wide range of living and nonliving materials proved most fruitful, particularly in the study of cancer initiation.1 He found that ratio to be constant at 14.200 to at least five significant figures in ocean water, for example, down to at least 6000 ft. In embryonic and very young rapidly growing tissues, however, he noted a tendency for the lighter isotope to be enriched, giving values of 14.35 ± 0.05. In very old tissues, he measured ratios as low as 13.75. In cancer tissues, the ratio remained close to 14.35, irrespective of the age of the subject.
http://www.arrowheadhealthworks.com/brewerwk.htm