Yamaha describes the products they plan to display at Emergency Services Show (ESS) 2012 in the UK, including flood rescue outboards and propeller guards in the October 2012 issue of Emergency Service Times.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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