@article{33309,
      author       = "Wray, James R. and VIII. International Cartographic
                      Conference, Moscow, U.S.S.R., 3 - 10 August 1976",
      title        = "Thematic Land Cover Maps of U.S. Urban Areas Compiled from
                      Aircraft, Landsat, and Skylab Sensors  ",
      year         = "1976",
      note         = "separát",
}