The building period : 1775-1815 -- The institutional period : 1816-1865 -- The reform period : 1866-1914 -- The unsettled period : 1915-1941 -- The global period : 1942-1963 -- The uncertain period : 1964-1994 -- The asymmetric period : 1995-2004.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.