This series consists of the manuscripts, and related materials, of Dr. Penfield's published and unpublished writings.

This series consists of correspondence, notes, reports, and report drafts which were created and collected by Dr. Penfield as part of his travels to, and work in, Britain, the Middle East, and the Soviet Union for the National Research Council of Canada during the Second World War. (TR = Travels)

Series consists of a drawer of catalogue cards with information concerning most MNI Fellows from between the institute's opening to the 1970s. Much of this information consists of mailing addresses which were compiled in the late 1970s and early 1980s, and is thus likely no longer accurate. Many of the cards are also accompanied by photographs of the particular Fellow.

This series contains the final drafts of Dr. Penfield's various published books.

Series consists of newspaper and magazine article clippings collected by Dr. Penfield.

Series consists of notes produced by Dr. Penfield on books and articles he had read.

This series contains material concerning the "Sussex", an English Channel passenger steamer on which Dr. Penfield was travelling in 1916 when it was hit by a German torpedo.

This series includes records of events, biographical and historical data, and many visual materials. Much of this material is ephemeral and was originally found in Dr. Penfield and Mrs. Penfield's boxes of memorabilia. The series is divided into 15 subseries, each of which may be grouped into two divisions: general and personal (indicated by addition of WGP to file identifier).

Photographs and illustrations of colleagues, physicians, and other medical professionals.