http://dla.library.upenn.edu:80//medren/feeds/search.mrss/medren/search.html?rows=500&fq=collection_facet%3A%22Lawrence%20J.%20Schoenberg%20Collection%22%20AND%20author_facet%3A%22Sacro%20Bosco%2C%20Joannes%20de%2C%20active%201230%22&Search in the Penn in Hand: Selected Manuscriptshttp://dla.library.upenn.edu:80/dla/medren/pageturn.html?fq=collection_facet%3A%22Lawrence%20J.%20Schoenberg%20Collection%22%20AND%20author_facet%3A%22Sacro%20Bosco%2C%20Joannes%20de%2C%20active%201230%22&id=MEDREN_4646348LJS 26 - Algorismus : Tractatum de sphaera (1225-1275)http://hdl.library.upenn.edu/1017/d/medren/4646348http://dla.library.upenn.edu:80/dla/medren/pageturn.html?fq=collection_facet%3A%22Lawrence%20J.%20Schoenberg%20Collection%22%20AND%20author_facet%3A%22Sacro%20Bosco%2C%20Joannes%20de%2C%20active%201230%22&id=MEDREN_4812482LJS 216 - Tractatum de spera ... [etc.] (1256-1270)http://hdl.library.upenn.edu/1017/d/medren/4812482http://dla.library.upenn.edu:80/dla/medren/pageturn.html?fq=collection_facet%3A%22Lawrence%20J.%20Schoenberg%20Collection%22%20AND%20author_facet%3A%22Sacro%20Bosco%2C%20Joannes%20de%2C%20active%201230%22&id=MEDREN_5963091LJS 494 - [Marʼeh ha-ofanim] ... [etc.] (1425-1450)http://hdl.library.upenn.edu/1017/d/medren/5963091