File:PSM V67 D432 Salary averages of usa university professors 1893 to 1905.png
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![File:PSM V67 D432 Salary averages of usa university professors 1893 to 1905.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/PSM_V67_D432_Salary_averages_of_usa_university_professors_1893_to_1905.png/800px-PSM_V67_D432_Salary_averages_of_usa_university_professors_1893_to_1905.png?20111013014403)
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