YouTube is a great resource for finding audio and visual clips fro this period. Just enter some relevant keywords, like cars 1930s.
Use the links below to find books on your topic. Exact terms to use and combine depend on your topic.
Reference librarians can help you select relevant terms and a good search strategy for your topic.
Other libraries may have copies of other newspapers. You can use either search Worldcat or the Center for Research Libraries' (CRL) catalog to see what might be available. CRL has more than 10,000 titles from most countries of the world and every state in the U.S., including over 1,800 U.S. ethnic titles and some of the earliest African American newspapers.
If you want to find names of newspapers for a particular city, and the dates of publication, see:
Gregory, Winifred, ed. American Newspapers, 1821-1936; A Union List of Files Available in the United States and Canada. New York: H.W. Wilson Company, 1937. HUNT REF-1 Z6951 .A498 1967
You can also find other digitized newspapers by using ICON: International Coalition on Newspapers Digitization Projects