mattkprovideo.com/2023/08/14/best-book-depository-footage/

This is probably the best 1963 newsreel footage of the Texas School Book Depository avail as stock footage to be used in documentaries.

https://www.pond5.com/stock-footage/item/98563352-police-investigate-during-assassination-president-john-kenne

https://www.pond5.com/stock-footage/item/98563352-police-investigate-during-assassination-president-john-kenne