There are many ways to search for entries about people in Franklin, the library catalog. One way is to do an exact search for a name: "mary elizabeth garrett" OR "garrett, mary elizabeth". This will pick up named entities mentioned in subject headings, table of contents entries, titles, and descriptions. Take care to try out different ways to express a person's name - for example, with or without a middle initial.
You can also search just within subject headings related to biographies. For example, both of these tags are found within Mary Elizabeth Garrett's biography:
Garrett, Mary Elizabeth, 1854-1915.
Women philanthropists -- Maryland -- Baltimore -- Biography.
Using the Franklin catalog dropdown and selecting Subject Heading Keyword would allow you to search for: mary elizabeth garrett biography, and any entry with all of those words would be retrieved.
Below are some sample searches to get you started.
There can be an overwhelming number of journal articles you might consider for perusal. Articles+, part of the Franklin Catalog, attempts to give access to articles across many databases here at Penn.
However, you might be interested in searching more narrowly within discipline-specific databases. This may not be as overwhelming. For example, you may want to look at articles about Julius Rosenwald in ERIC, an education-related database, as well as in America: History and Life. Links to some suggested databases are below.
A note about book reviews: Many journal articles about your subjects may not be independently research articles at all, but rather, book reviews which are published in journal articles. These will be scholars giving overviews and critiques of books you may have already encountered above. Some databases, like Articles+, have filters to exclude book reviews, but those filters can be incomplete. Just be aware of what you're looking at: is it an independently research article, or a review of a book?