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WikiPedia: 1500 Jyväskylä ftp://ftp.lowell.edu/pub/elgb/astorb.html http://cfa-www.harvard.edu/iau/lists/NumberedMPs.h... http://cfa-www.harvard.edu/iau/lists/Sizes.html http://neo.jpl.nasa.gov/cgi-bin/db?name=Jyvaskyla