1. [George Mayerle eye test chart]: [negative image] Author(s): Mayerle, George. Publication: [San Francisco] : Schmidt Litho Co., c1907 Subject(s): Vision Tests
2. [George Mayerle eye test chart]: [positive image] Author(s): Mayerle, George. Publication: [San Francisco] : Schmidt Litho Co., c1907 Subject(s): Vision Tests
