Data can be found in the "AdSpender" listed above.
Advertising Expenditures in the U.S. (Grand Total and by Type of Media)
Data from 1900- present is available in "U.S. Advertising Expenditure Data"
Editor & Publisher Market Guide. (Langsam Library Latest Reference (Print) -- link to Library Catalog)
Gives data on the market of 1,600 daily newspapers in the United States and Canada. In addition data is given on population, ages and ethnicity, housing, income, education, retail sales, etc..