Fort Mackinac Michigan June 27th 1874.
To the
Curator U.S.A. Medical Museum
Washington D.C.
Sir:
I have the honor to send a dozen photographs of scenery of Mackinac Island for the museum to complete the series sent Sep't 18th 1873.
Very Respectfully
Your obedient servant
Carlos Carvallo.
Ass't. Surgeon U.S. Army
[OHA 26]