These two postals were bought one at the pan American Exposition and one at Niagara Falls.
MLA
Hollister, Howard K. (Howard Keys), b. 1889. These two postals were bought one at the pan American Exposition and one at Niagara Falls.. 1903 February 11. https://collections.library.yale.edu/catalog/2030699.
APA, 6th edition
Hollister, Howard K. (Howard Keys), b. 1889. (1903 February 11)[These two postals were bought one at the pan American Exposition and one at Niagara Falls.]. https://collections.library.yale.edu/catalog/2030699.
