United States Civil Service Commission, Central Board of United States Civil Service Examiners, Bureau of Reclamation, Denver Federal Center, Denver, Colo., announcing examination for student trainee (engineering), $2,900, $3,175, and $3,415 a year (grades GS-2, GS-3, and GS-4), options, civil, electrical, mechanical, announcement 10-1-4-(56), Feb. 1, 1956.