1351. Harvard University, MS Typ 657 Title: Book of hours Author: Catholic Church Date: ca. 1475-ca. 1500
1356. Harvard University, MS Typ 553 Title: Book of hours Author: Catholic Church Date: ca. 1450-ca. 1500
1359. Harvard University, MS Eng 920 Title: Treatise on astrolabes Author: Geoffrey Chaucer Date: ca. 1400