Useful Search phrases:
Keep searches simple. Example, interested in the impact of the revolution on trade?
Try "haitian revolution" AND (trade OR commerce OR shipping)
Limit to books and ebooks, and try basic searches. Useful terms include
The Subject heading for the Haitian Revolution is Haiti -- History -- Revolution, 1791-1804 ; In the second search box, add a keyword or two to narrow the results to your topic. Example: if I'm interested in runaway enslaved individuals, I would try "runaway" OR "escaped" in the second box.