Project Gutenberg 2010-04-24 Public domain in the USA. 191 Moulton, Forest Ray 1872 1952 Moulton, F. R. (Forest Ray) An Introduction to Astronomy en Astronomy QB Text Astronomy Browsing: Science - Astronomy Browsing: Science - General 13901425 2010-04-24T18:57:15 application/pdf 13136093 2010-04-24T18:57:17 application/pdf application/zip 1370135 2021-06-11T17:20:24 application/prs.tex 11990135 2021-06-11T17:20:24 application/prs.tex application/zip 9721 2024-10-13T13:45:47.057771 application/rdf+xml 11769 2024-10-13T13:45:46.874763 image/jpeg 2814 2024-10-13T13:45:46.603773 image/jpeg Archives containing the RDF files for *all* our books can be downloaded at https://www.gutenberg.org/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia