That's what I was thinking; make an index that consists primarily of plain text (not hyperlinked), but link things that are harder to search for, like "state tree."
For example, if "Charles Murphy" is indexed to three separate pages and "John Ledyard" is indexed to two pages, then the index might look like this:
Ledyard, John
Murphy, Charles
...letting readers know these subjects exist. They could then do a simple search to find all occurrences of those names.
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