The National Archives at Philadelphia maintains the historically significant records of the Federal Agencies and Courts, in Delaware, Maryland, Pennsylvania, Virginia and West Virginia, dating from 1789 to the present. These historical records are open to the public. The National Archives at Philadelphia's WWI holdings include, but are not limited to, records related to home front efforts, military intelligence, subversive activity, weapons, technology, soldiers, and the federal government's role during the Great War.
Record Group 4: Records of the U.S. Food Administration - http://www.archives.gov/research/guide-fed-records/groups/004.html
Record Group 163: Records of the Selective Service System (World War I) - http://www.archives.gov/research/guide-fed-records/groups/163.html