http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f1-subject%3DObservatory%20(space-based);f2-subject%3DHEAO-2 Results for your query: expand=subject;f1-subject=Observatory (space-based);f2-subject=HEAO-2 Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/8005694/8005694.dc.xml Renamed the Einstein Observatory after launch, the image on the left shows HEAO-2 during pre-flight testing. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/8005694/8005694.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/heao2_diagram/heao2_diagram.dc.xml Renamed the Einstein Observatory after launch, the image on the left shows HEAO-2 during pre-flight testing. This image shows the placement of the instruments onboard the observatory. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/heao2_diagram/heao2_diagram.dc.xml Thu, 01 Jan 1970 12:00:00 GMT