"Engineering." . . "Merchant marine." . . . . . "Engineering general subjects"@en . . . . . . . . "Merchant marine examination questions. 11, Engineering general subjects"@en . . . . . . . . "Examinations"@en . . . . . "Periodicals"@en . . . "Examinations." . . "Engineering United States Examinations, questions, etc. Periodicals." . . "United States. Coast Guard." . . "United States. Coast Guard" . . . "United States." . . "Merchant marine United States Examinations, questions, etc. Periodicals." . .