U.S. Coast Guard 1989 National Boating Safety Advisory Council (NBSAC) Subcommittee on Propeller Guards Report Timeline Chart.
Aspects of the Propeller Safety Debate chart
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart