Matches in DBpedia 2016-04 for { ?s ?p <https://books.google.com/books?id=VYyldcYfq3MC&pg=PA508&lpg=PA508&dq=astrophotography+%22professional+astronomers%22&source=bl&ots=sYsdxtKm8S&sig=tetwY1OgHcgsaHL0ul-lBLMNavc&hl=en&ei=SL-GS9bVDc6JlAfLgLXVCw&sa=X&oi=book_result&ct=result&resnum=7&ved=0CBkQ6AEwBjge#v=onepage&q=astrophotography%20%22professional%20astronomers%22&f=false> }
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