https://en.wikipedia.org/wiki/Sniper
https://en.wikipedia.org/wiki/List_of_snipers
https://owlcation.com/humanities/Top-Ten-Deadliest-Snipers-in-History
https://en.wikipedia.org/wiki/Chuck_Mawhinney
https://en.wikipedia.org/wiki/Henry_Norwest
https://en.wikipedia.org/wiki/Billy_Sing
https://en.wikipedia.org/wiki/Chris_Kyle
https://en.wikipedia.org/wiki/Vasily_Zaitsev_(sniper)
https://en.wikipedia.org/wiki/Lyudmila_Pavlichenko
https://en.wikipedia.org/wiki/Abu_Tahsin_al-Salhi
https://en.wikipedia.org/wiki/Francis_Pegahmagabow
https://en.wikipedia.org/wiki/Fyodor_Okhlopkov
https://en.wikipedia.org/wiki/Simo_H%C3%A4yh%C3%A4
https://en.wikipedia.org/wiki/Winter_War