N. W. Ayer & Son. N. W. Ayer & Son's American Newspaper Annual: containing a Catalogue of American Newspapers, a List of All Newspapers of the United States and Canada, 1906, Volume 2, book, 1906; (https://digital.library.unt.edu/ark:/67531/metadc9298/m1/94/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .