When trying to track down books on a general topic, you can use Library of Congress Subject Headings to help you:

1. Go to the the ASA Catalog
2. Type "medical anthropology". (Don't forget quotes!)
3. Click on the "Subject" button. 
4. View the results and use the refining categories on the right to narrow down your results.

Try these related subject headings for even more results: 

• Traditional medicine
• Public health anthropological aspects
• Health and race
• Social medicine  
• World health 
• Medical anthropology
• Medicine -- Cross-cultural studies 
• Health -- Cross-cultural studies 
• Diseases -- Social aspects 

Below are several ebooks on these subjects.