Photographs should be in focus, be of high contrast, and should not be lettered with a ball pencil, felt pen or ink. Colour illustrations will not be accepted in the printed version of SDHM; however, they will be accepted in the online version of SDHM. Line drawings should be supplied as clear black- and-white drawings suitable for reduction rates of 40-50%. Lettering should be of standard vertical type and large enough, so that, after reduction, it will not be less than 2 mm size. Submission of digital images is preferred, and strongly suggested.