Jane's Encyclopedia of Aviation
Spencer Amphibian Air Car Model S-12-D and -E (USA)
Four-seat amphibians, plans for which are available to amateur constructors.
Spencer S-12-E Air Car (1998)
Spencer Amphibian Air Car Model S-12-E (285 hp Continental Tiara 6-285-B engine)
Spencer Amphibian Air Car Model S-12-D (260 hp Lycoming O-540 engine)
Spencer Amphibian Air Car Model S-12-E (285 hp Continental Tiara 6-285-B engine)
Wikipedia