A readable version of the article can be found at: https://books.google.com/books?id=Svbq5reRKUwC&pg=PA52&lpg=PA52&dq=tripp+47+rating&source=bl&ots=5YZQF-dHqE&sig=ACfU3U01wF7uaYadRpPGDu2IMGwF8jQafQ&hl=en&sa=X&ved=2ahUKEwjW6Ju6pYrwAhXUHM0KHaUjBk8Q6AEwCHoECA4QAw#v=onepage&q=tripp%2047%20rating&f=false
