U.S. Coast Guard annual boating accident statistics report for 2010 recreational boat propeller fatalities in which being struck by a propeller was the first event in the sequence of events.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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