A wordle of the front page of the old Propeller Guard Information Center web site before their June 2011 move to PropellerSafety.com. The wordle displays many propeller safety terms.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart
Four Volume Review of the Boating Industry’s Boat Propeller Guard Product Liability Defense