The first volume of Beebe's pheasant monograph was published that fall, although the ongoing war made it unclear when the remaining three volumes would be published. The first volume was highly praised by reviewers, and received the Daniel Giraud Elliot Medal from the National Academy of Sciences in 1918. In January 1919 Roosevelt, who was severely ill by this point, wrote to Beebe from his hospital bed congratulating Beebe on the publication of his monograph. His letter of congratulation to Beebe was the last letter that Roosevelt wrote before his death. Volume II of the monograph was published in 1921, and volumes III and IV were published in 1922. The completed work, titled "A Monograph of the Pheasants", has been considered by some reviewers to be possibly the greatest ornithological monograph of the twentieth century.