Sourcesfr.wikipedia.org/wiki/Attentat_de_Sarajevo 
centenaire.org/fr 
fr.wikipedia.org/wiki/Bataille_de_la_Marne 
fr.wikipedia.org/wiki/Bataille_de_Verdun_(1916) 
fr.wikipedia.org/wiki/Bataille_de_la_Somme 
fr.wikipedia.org/wiki/Assassinat_de_Jean_Jaur%C3%A8s 
fr.wikipedia.org/wiki/Philippe_P%C3%A9tain 
fr.wikipedia.org/wiki/Vladimir_Ilitch_L%C3%A9nine 
fr.wikipedia.org/wiki/Obus 
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