Great brochure the city puts out. Theirs is the expanded version of the rodent (usually mouse) lecture I give to food store, warehouse, and factory managers:
1. kill
2. clean up
3. fix holes

done in increasing order of emphasis required rather than chronological as in the brochure. Most places have exterminators but also have crumbs in crevices and tons of entry points and hidey-holes.

Dr Robert Corrigan, who I believe is the city's chief rat expert consultant, has given excellent lectures to state food inspectors on a variety of vermin.