Type-written introduction page to manuscript monograph on the endocrine system composed by Elizabeth Mason. The introduction details the difference between essential and optional photography and also explains the inclusion of line drawings of routine photographic positions.
- Medicine Study and Teaching, Medicine Societies, Etc., Photography and Medical Photography
- Access is given in accordance with the NSMM access policy. This archive contains medical photography termed as medical records and some other personal data. This series is closed as it contains medical photography with identifying patient data.