Columbia subject headings:
Harvard subject headings:
Breast--Radiography--Pennsylvania.
Breast--Radiography--United States.
Medical screening--Pennsylvania.
Medical screening--United States.
Women--Medical examinations--Pennsylvania.
Women--Medical examinations--United States.
Princeton subject headings:
Breast--Radiography--Pennsylvania.
Breast--Radiography--United States.
Medical screening--Pennsylvania.
Medical screening--United States.
Women--Medical examinations--Pennsylvania.
Women--Medical examinations--United States.