The abundance of carefully prepared microdrawings of rock types and textures was a feature that maintained the demand for Harker's 1954 text Petrology for Students as a guide to the study of rocks in thin slices under the microscope. This 1978 successor makes Harker's microdrawings, together with over 60 further ones, available in an original petrographic text, amplifying the coverage to embrace rock types whose importance had increased since Harker's...