(1939). General tests, United States civil service; a complete and authoritative course of examination type questions and answers.
Chicago-čujuhus (17. p.)General Tests, United States Civil Service; a Complete and Authoritative Course of Examination Type Questions and Answers. 1939.
MLA-čujuhus (9. p.)General Tests, United States Civil Service; a Complete and Authoritative Course of Examination Type Questions and Answers. 1939.
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