http://books.google.com/books?vid=ISBN978-0-486-20917-3
1406
http://citation.dbpedia.org/hash/dfd5eeebfc1a1af4faf40c1b08844036f53be41995f5f1f1a700f8eed2c1996d
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http://books.google.com/books?vid=ISBN0-486-20917-2
1
https://books.google.com/books?id=5DoDAAAAQAAJ&pg=PA130&dq=discovered+the+Cassini+Division+inch+telescope&hl=en&ei=gKPKTuG-CsqctwfL09yHDA&sa=X&oi=book_result&ct=result&resnum=9&ved=0CFkQ6AEwCDhG#v=onepage&q=discovered%20the%20Cassini%20Division%20inch%20telescope&f=false
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