The Hunter College Libraries acquired a new database called The HistoryMakers (login required), "an archive of filmed oral history interviews of contemporary African Americans who have shaped modern history and made significant contributions to history, politics, education, law, arts, science, business, the military, and sports."
We now have access to the full Life Magazine archive online. Find it in our Databases list under the letter L. It includes full page scans from the magazine from 1936-2000, with all the advertisements and all context indexed and searchable.
Visual researchers, take note! This is an excellent place for 20th Century American research.
A search for SPAM yielded this gem from 1940: