Sometimes browsing the library stacks can help you find books you didn't even know you were looking for. The following are good areas to peruse.
LB3401-3495: School Hygiene, school health services
RA421-790.95: Public Health, Hygiene, Preventive Medicine
RA440-440.87: Public Health, Study and teaching
Maps of the library are available at the 2nd floor Reference Desk, elevator lobbies, and also online.
After you find a useful book, scroll down to the "Details" heading to find the book's "Subjects." Here you'll find a list of related subjects that you might consider adding to your search. You can also click on a subject link in the record, e.g. clicking on "Community health services" would bring up a list of all the Library's books, journals, etc. on that topic.