There are two major subsets of ProQuest newspapers.
One is their "Newsstream" databases that are listed by geographical region (e.g., U.S. Newsstream, African Newsstream, etc.). These are generally text-only databases, that is, there are no images or charts. If there are such images or charts available, there is normally a link to view these items. Many of these newspapers have historical issues available. Locate a title through the "Publications" tab on the database. Each newspaper will provide the date range that is available.
The second set of ProQuest newspapers are the "Historical Newspaper" series. These are more specific groupings of newspapers, such as "American Hebrew & Jewish Messenger, 1857-1922" or "Atlanta Constitution, 1868-1984." The description for each newspaper will have a tag of "Part of the ProQuest Historical Newspapers series."