Here's what the abstract said:
"The rejection letters were received within an 18 week period. Of the 314, 111 were form letters, 101 were personalized form letters, 43 were real letters, 7 were helpful letters, and 52 were notes written on top of the submission cover letter. The purpose is to graphically show the frequency and type of rejection letters so novice authors won't be shocked, get depressed, or take a rejection personally. A rotation submission system is suggested for novice authors to help reduce the expense and minimize the time and effort involved."