“…Therefore, we developed three variables describing each county's access to ''major'' rivers because the size of dredging and port projects was likely to increase as the rivers increase in size. Our first definition of a major river is one that passes through 50 or 15 For discussions of the determinants of New Deal spending, see Reading (1973), Wright (1974), Wallis (1987Wallis ( , 1998Wallis ( , 2001), Anderson and Tollison (1991), Couch and Shughart (1998), , Fleck (1999aFleck ( ,b, 2001a, Couch and Williams (1999), and Fishback et al (2003b). The last paper summarizes the results of all of the studies and provides new estimates.…”