In the study of human settlements, an urban agglomeration is an extended city or town area comprising the built-up area of a central place and any suburbs linked by continuous urban area.
Ulmus 'Urban' is an American hybrid elm cultivar selected from the progeny of a controlled crossing of the Siberian Elm Ulmus pumila with the Dutch clone '148' in 1958 by Toru Arisumi of the USDA at Columbus, Ohio.
Orban, also known as Urban, was an iron founder and engineer from Brassó, Transylvania, in the Kingdom of Hungary, who cast large-calibre artillery for the Ottoman siege of Constantinople in 1453.
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