Hi Luca:

I use this sippnet to access Night images mosaics from DMSP satellites from 1992 to 2010. Before these dates I don't know any other souerces

var F16_2010_blended_tif = new OpenLayers.Layer.WMS( "2010",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F16_2010_blended.lzw.tif'},

{attribution:"DMSP-OLS www.meridi.es"});

var F162009 = new OpenLayers.Layer.WMS( "2009",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162009.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F162008 = new OpenLayers.Layer.WMS( "2008",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162008.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F162007 = new OpenLayers.Layer.WMS( "2007",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162007.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F162006 = new OpenLayers.Layer.WMS( "2006",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162006.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F162005 = new OpenLayers.Layer.WMS( "2005",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162005.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F162004 = new OpenLayers.Layer.WMS( "2004",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F162004.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F152003 = new OpenLayers.Layer.WMS( "2003",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F152003.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F152002 = new OpenLayers.Layer.WMS( "2002",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F152002.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F152001 = new OpenLayers.Layer.WMS( "2001",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F152001.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F152000 = new OpenLayers.Layer.WMS( "2000",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F152000.v4b_web.stable_lights.avg_vis.lzw.tif'});

var F141999 = new OpenLayers.Layer.WMS( "1999",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F141999.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F141998 = new OpenLayers.Layer.WMS( "1998",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F141998.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F141997 = new OpenLayers.Layer.WMS( "1997",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F141997.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F121996 = new OpenLayers.Layer.WMS( "1996",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F121996.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F121995 = new OpenLayers.Layer.WMS( "1995",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F121995.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F121994 = new OpenLayers.Layer.WMS( "1994",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F121994.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F101993 = new OpenLayers.Layer.WMS( "1993",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F101993.v4b_web.stable_lights.avg_vis.lzw.tif'} );

var F101992 = new OpenLayers.Layer.WMS( "1992",

"http://mapserver.ngdc.noaa.gov/cgi-bin/public/ms/gcv4?",

{layers: 'F101992.v4b_web.stable_lights.avg_vis.lzw.tif'} );

Thanks Josè, I know these layers, however I'd need something older than 1992

Luca, you might also hear ISTIL on this issue unless you have already done so.

http://www.lightpollution.it/istil/index.html

For old Landsat data, you can look in particular for the Global Land Survey collection, with the GLS 1975 epoch (with imagery actually acquired over a 1972 - 1981 period over Europe). Can be viewed directly from ArcGIS as an ESRI service, Cf. the blog entry.

I don't know of any Europe-wide Landsat-based urban cover for the 70s though. The noticeable exception being a 1975-1990 LCC analysis made for a research project, restricted on a 10km coastal hinterland, Cf. below

http://blogs.esri.com/esri/arcgis/2011/05/13/using-landsat-services-to-study-land-cover-change-over-time/

http://www.eea.europa.eu/data-and-maps/data/corine-land-cover-1990-clc1990-and-corine-land-cover-changes-1975-1990-in-a-10-km-zone-around-the-coast-of-europe