This sub-series consists of illustrations and photographs which were included as part of a number of Dr. Penfield's published writings. Each of the series' file numbers (ex. W/PV XX) correspond to the published writing file in which the images were used (ex. W/P XX).

This sub-series contains non-professional material created by Dr. Penfield which was unfinished at the time of his death in 1976.

Subseries consists of unpublished writings, including talks, addresses, articles, unfinished papers, etc. many of which are printed or published, in full or in part, in some other form and filed elsewhere. (W/U = Writings / Unpublished)

Subseries consists of unpublished writings, arranged by subject. This sub-series includes lecture notes, unfinished jobs, and some published writings. In addition, W/US 33, 34 and 35 consist of similar material which was found loose in Dr. Penfield's office after his death. (W/US = Writings / Unpublished by Subject)

Subseries consists of visual material Dr. Penfield used to illustrate his writings. (W/V = Writings / Visual)

Subseries consists of files containing additional material used by Dr. Penfield in the production of some of his published articles.

Subseries consists of card indexes of Dr. Penfield's writings. These indexes were produced by Dr. Penfield himself.