U.S. Department of Health & Human Services
Mrs. Pearl Caldwell operates the MacBeth densitometer
National Library of Medicine (U.S.). Reference Services Division.
The National Library of Medicine believes this item to be in the public domain.
1 photographic print : 21 x 26 cm.
black and white
NLM Unique ID:
See catalog record
NLM Image ID:
Master Image (TIFF)
Standard Image (JPG)
Metadata (Dublin Core)