HathiTrust: Original images: ca.300dpi, grayscale jpg files approx. 3130 by 3870 pixels. Editing: re-sampled to 600dpi, converted to black and white tif files, de-skewed, and set uniform margins. SBB: Original images: ca.300dpi, color tif files approx. 3280 by 4055 pixels. Editing: re-sampled to 600dpi, converted to black and white tif files, de-skewed, and set uniform margins.