The 1966 edition of the catalog, is shown as print book in the photograph above. This was followed by 1968 and 1971 (the “red” book): the 1986 edition (“yellow” book) are shown in the photograph. “Online Mendelian Inheritance in Man” is available today. Today, the DNA sequence of a single, human is 1000 book of 1000 pages per book. Before the “computer age” this DNA chemistry was not technically possible.