What has the author Beardsley Ruml written?

Beardsley Ruml has written:

'Teaching salaries then and now' -- subject(s): Occupations, Salaries, pensions, Teachers, Wages

'The five percent' -- subject(s): Corporations, Income tax, Tax exemption, Taxation

'The reliability of mental tests in the division of an academic group' -- subject(s): Grading and marking (Students), Mental tests, Educational tests and measurements