www.ipmsairrace.org

Anchor text: The May–June 1909 'Port Aviation' meetings – the world's first air races

Wikipedia: Air racing

Anchor text: IPMS Air race. Port Aviation Pdf

Wikipedia: Henri Rougier

Anchor text: IPMS The Racing and Record Aircraft Special Interest Group Plastic Modelers Society

Wikipedia: Macchi M.33

Anchor text: IPMS Racing & Record Aircraft SIG - Record List

Wikipedia: SIAI S.51

Wikipedia: November 1926