<Li> Jump up ^ Nye 1996, p. 79 . </Li> <Li> ^ Jump up to: Griggs 2006b, p. 82 . </Li> <Li> Jump up ^ Middleton 2001, pp. 8--9 . </Li> <Li> Jump up ^ Scott 2001, p. 322 . </Li>

What is the historical significance of the niagara falls bridge