Opportunities for college students to participate as trainees in vacation work-study programs leading to professional careers in engineering, physical sciences, mathematical sciences, GS-3, $88 a week, GS-4, $98 a week, apply to Interagency Board of U.S. Civil Service Examiners for Washington, D.C, 1900 E Street NW., Washington, D.C 20415, announcement WAP-818.