http://www.rssboard.org/rss-specification 720 XTF Search Results (expand=subject;f5-subject=Instrument;f4-associated-Lesson=Gamma Ray Impact) http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f5-subject%3DInstrument;f4-associated-Lesson%3DGamma%20Ray%20Impact Results for your query: expand=subject;f5-subject=Instrument;f4-associated-Lesson=Gamma Ray Impact Thu, 01 Jan 1970 12:00:00 GMT Oronce Fine, De mundi sphaera (Paris, 1542). http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/aristotle-solar-system/aristotle-solar-system.dc.xml Illustration of Oronce Fine, Astronomy personified and an armillary sphere. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/aristotle-solar-system/aristotle-solar-system.dc.xml Thu, 01 Jan 1970 12:00:00 GMT