Many organizational websites and digital collections have primary source documents and images.
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1914). Women's Peace Parade Retrieved from http://digitalcollections.nypl.org/items/510d47dd-a6cd-a3d9-e040-e00a18064a9
George Arents Collection, The New York Public Library. Do you know why is the olive branch a symbol of peace? Retrieved from http://digitalcollections.nypl.org/items/510d47e2-e61a-a3d9-e040-e00a18064a99