Johns Hopkins was an university located in Maryland. This university educated individuals in the medical arts. For the students who graduated, they received a M.D.
In Dangerous Grounds, Doctor John Rawley was one such student. He had transferred from Harvard University upon graduation. Before graduating from Johns Hopkins, Rawley had decided to pursue a career in psychiatry. (TNG: "The Big Goodbye")
The pages seen in the episode were from the mystery novel, Dangerous Groud, by author Frances Sil Wickware. This novel was published in 1946. Information on Johns Hopkins was from page 12.