The Era of the Library of the Office of the Army Surgeon General and John Shaw Billing: 1836-1898
The Era of the Gentleman Physician Librarian: 1898 to 1945
The Era of the Development of the Clinical Research Infrastructure (NIH), the Rapid Expansion in Funded and Published Clinical Research and the Emergence of Medical Librarianship as a Profession: 1945-1962
The Era of the Development of the National Library of Medicine, Online digital Subject Searching (Medline) and the Creation of the Health Science Library Infrastructure: 1962-1975
The Medline Era: A Golden Age for Medical Libraries: 1975-1995
The Era of Universal Access to Information and the Transition from Paper to Digitally Based Medical Libraries: 1995-2015
The Era of the Digital Health Sciences Library: 2015-.