Dr. Good test of backing up boat with propeller guard in Robin Listman vs. OMC (Outboard Marine Corporation) boat propeller injury test.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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