Fo-Mac 1970 advertisement on pg 7 of the Nov/Dec 1970 issue of The Lunker Hole magazine. Vol.1. No.4.
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Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC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