http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f70-subject=Astronomical instruments) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f70-subject%3DAstronomical%20instruments Results for your query: docsPerPage=100;f70-subject=Astronomical instruments Thu, 01 Jan 1970 12:00:00 GMT A treatise on the principal mathematical instruments employed in surveying, levelling & astronomy: explaining their construction, adjustments and use. Simms, Frederic Walter, 1803-1865 https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT