@inbook{NBERc11980,
 Crossref = "NBERlibe10-1",
 title = "Climate Change: Adaptations in Historical Perspective",
 author = "Gary D. Libecap and Richard H. Steckel",
 BookTitle = "The Economics of Climate Change: Adaptations Past and Present",
 Publisher = "University of Chicago Press",
 pages = "1-22",
 year = "2011",
 month = "May",
 URL = "http://www.nber.org/chapters/c11980",
}
@book{NBERlibe10-1,
 title = "The Economics of Climate Change: Adaptations Past and Present",
 author = "Gary D. Libecap and Richard H. Steckel",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2011",
 URL = "http://www.nber.org/books/libe10-1",
}