FIRST DAY OF ISSUE
DR.CHARLES H. MAYO
1865-1939
Art Craft
H1+50th
MAYO C
YEAR M
CENTER
TAL 64N
MAYO
PRACTICE
EDUCATION
RESEARCH
EAR
MAYO
FOUNDATI
DR. WILLIAM J. MAYO
1861-1939
HONORING THE
Doctors Mayo
THEY REVERED THE TRUTH
AND SOUGHT TO KNOW IT
SEP
1964
MINN
U.S.POSTAGE 5
DOCTORS
MAYUJ
FIRST DAY OF ISSUE
