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bhl biodiversity heritage library natural history illustrations art of life missouri botanical garden crowdsourcing lod open data open access images linked data digital libraries schema botany dlf forum cbi illustrations art science natural history flickr ndsr global names architecture citations user-generated metadata imls smithsonian library biodiversity digital librarians annotation application profiles vra core data standards linked open data semantic web cultural heritage rdf tdwg open content metadata correspondence history of science george engelmann museums and the web center for biodiversity informatics mobot scientists