Deer Island 12 August 2012 satellite image appears to show the Bean 20 barge. Low resolution version. Courtesy of DigitialGlobe.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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