The collection consists of registration forms completed by German-born Americans in Oregon and by U.S.-born women who had married German-born men. The forms, titled "Registration Affidavit of Enemy Alien," include information about registrants such as name; date and place of birth; date of immigration to the United States; and whether any of their relatives were fighting on either side of World War I. Forms for men include a section about occupational history since 1914, while forms for women include a section about any children they had. Each form also includes a photograph and the fingerprints of the registrant. Some registration forms are accompanied by related permits and correspondence. The correspondence includes letters between U.S. marshals and Oregon police chiefs or postmasters.