See the graph on this page, it's very sad: https://www.techdirt.com/articles/20120330/12402418305/why-missing-20th-century-books-is-even-worse-than-it-seems.sht

See the graph on this page, it's very sad: https://www.techdirt.com/articles/20120330/12402418305/why-missing-20th-century-books-is-even-worse-than-it-seems.shtml https://www.techdirt.com/articles/20120330/12402418305/why-m... Also many old films have been lost for similar reasons.