Graybeal, William S.2023-01-272023-01-271952http://hdl.handle.net/10919/1134593 unnumbered, 21 pages, 1 unnumbered leavesapplication/pdfenIn CopyrightLD5655.V855 1952.G739Education, SecondaryHigh school teachers -- Rating ofThe influence of the number of daily preparations upon teaching efficiency of high school teachersThesis