What has the author John Harkness Dales written?

Here are some of the works written by John Harkness Dales:

- "How to Become a Doctor: A guide to the medical profession

- "Medical Science: A Guide for the Public"

- "The Doctor's Daughter: A Story of Devotion"

- "Hygiene and Public Health: A textbook for schools"

- "Lectures on Materia Medica and Therapeutics"

- "Principles of Physical Diagnosis"