Newspapers can often be great sources of
primary research materials.
Unfortunately not all newspapers are
available in digital format.
Some newspapers are only available on
microfiche and/or microfilm, especially from 1923-1980s.
.
To find articles in the San Francisco Chronicle in 1953,
for example, you would first start with the index on microfiche
(in the Microform area of the Library).
Once you found the correct entries, you would note the date of the paper, and the page/column (see below).
Then you could find the roll of microfilm, put it in the reader/scanner, and find the article:
SF Chronicle, 9-2-53, p.4, col. 1