San Ysidro – 1984

https://www.nytimes.com/1984/07/19/us/coast-man-kills-20-in-rampage-at-a-restaurant.html?searchResultPosition=11

https://www.nytimes.com/1984/07/20/us/weapons-used-by-killer-said-to-be-easy-to-obtain.html?searchResultPosition=14

https://www.nytimes.com/1984/07/20/us/neighbors-term-mass-slayer-a-quiet-but-hotheaded-loner.html?searchResultPosition=19

https://www.nytimes.com/1984/07/22/weekinreview/the-nation-day-of-killing-in-california.html?searchResultPosition=6

https://www.nytimes.com/1984/07/22/us/mass-is-said-for-six-san-ysidro-victims.html?searchResultPosition=1

https://www.nytimes.com/1984/07/24/us/around-the-nation-reopening-of-restaurant-where-21-died-held-up.html?searchResultPosition=3

https://www.nytimes.com/1984/07/21/us/san-diego-to-review-its-swat-team-procedures.html?searchResultPosition=3

Columbine – 1999

https://www.nytimes.com/1999/04/21/us/terror-littleton-president-clinton-shocked-saddened-hopes-for-prevention.html?searchResultPosition=4

https://www.nytimes.com/1999/04/21/us/terror-littleton-overview-2-students-colorado-school-said-gun-down-many-23-kill.html?searchResultPosition=8

https://www.nytimes.com/1999/04/23/us/terror-littleton-overview-2-youths-wanted-destroy-school-sheriff-says.html?searchResultPosition=5

https://www.nytimes.com/1999/04/24/us/terror-in-littleton-guns-in-school-shootings-are-identified.html?searchResultPosition=4

https://www.nytimes.com/1999/04/25/us/terror-in-littleton-the-motives-when-violent-fantasy-emerges-as-reality.html?searchResultPosition=10

https://www.nytimes.com/1999/04/26/us/terror-in-littleton-the-service-70000-mourn-in-quiet-tears-song-and-rain.html?searchResultPosition=1

https://www.nytimes.com/1999/04/26/us/terror-littleton-gun-debate-renewed-battle-over-weapons-control-both-sides-use.html?searchResultPosition=5

Virginia Tech – 2007

https://www.nytimes.com/2007/04/16/us/16cnd-shooting.html?searchResultPosition=4

https://www.nytimes.com/2007/04/17/us/17virginia.html?searchResultPosition=6

https://www.nytimes.com/2007/04/20/us/20cnd-virginia.html?searchResultPosition=10

https://www.nytimes.com/2007/04/18/us/18pistols.html?searchResultPosition=17

https://www.nytimes.com/2007/04/20/us/20english.html?searchResultPosition=25

https://www.nytimes.com/2007/04/19/us/19weapons.html?searchResultPosition=47

Las Vegas – 2017

https://www.nytimes.com/2017/10/04/us/police-response-mass-shootings.html?searchResultPosition=8

https://www.nytimes.com/2017/10/05/us/vegas-motive-mass-shootings.html?searchResultPosition=11

https://www.nytimes.com/2017/10/02/us/las-vegas-shooting-live-updates.html?searchResultPosition=13

https://www.nytimes.com/2017/10/04/us/las-vegas-shooting.html?searchResultPosition=32

https://www.nytimes.com/2017/10/07/us/stephen-paddock-vegas.html?searchResultPosition=12

https://www.nytimes.com/2017/10/06/us/las-vegas-shooting.html?searchResultPosition=1

https://www.nytimes.com/2017/10/02/us/las-vegas-shooting.html?searchResultPosition=6

About the author