ArchivalResource
Clemens, Samuel Langhorne, 1835-1910. ALS, 1901 Jan. 29; 1902 April 10, New York postcards to the Plasmon (Milk Products Co.), New York.
ALS, 1901 Jan. 29; 1902 April 10, New York postcards to the Plasmon (Milk Products Co.), New York.
http://www.worldcat.org/oclc/40470281
Three deal with Twain investing in a health food product known as "Plasmon."
Copley Press, J S Copley Library
SNAC Resource ID: 7426888