http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
En la port.: Marcial Echenique, David Crowther and Walton Lindsay.
This is a Working paper 26 of the centre for Land Use and Built Form Studies in the University of Cambridge, prepared within the Urban Systems Study under the sponsorship of the Centre for Environmetal Studies for presentation at the meeting of the British Section of the Regional Science Associaton, London, 21-23 August, 1969.