@inbook{NBERc4951,
 Crossref = "NBERcomm29-1",
 title = "VOLUME 1   Recent Economic Changes: Introduction",
 author = "Edwin Gay",
 BookTitle = "Recent Economic Changes in the United States, Volumes 1 and 2",
 Publisher = "NBER",
 pages = "1-12",
 year = "1929",
 URL = "http://www.nber.org/chapters/c4951",
}
@book{NBERcomm29-1,
 title = "Recent Economic Changes in the United States, Volumes 1 and 2",
 author = "Committee on Recent Economic Changes",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1929",
 URL = "http://www.nber.org/books/comm29-1",
}