You know, that dictionary in the PhotoReading Personal Learning Course is for playing the dictionary game. The key is some text with the words in alphabetical order so that they are easy to find.
When we were first producing the course, we needed a dictionary that fit in the vinyl album. We could not find one, but we found a dictionary publisher who was willing to publish one to the thickness we needed.
It was a perfect fit.
Then we noticed that many basic words weren't in the dictionary. Words such as "tree."
I called the publisher and asked him what happened. He said to get the dictionary to the thickness we wanted he had to remove words. I why he took out such basic words. He said that they used a computer program to remove every fifth word (or some such interval).
As such, the dictionary is tree-free.