The page scanning for these pdf copies of Ehrenberg publications have been done by a small army of volunteers over a period of many years.  Compact, low resolution single file versions of selected publications (1838, 40, 42, 43, 44, 56 and the Mikrogeologie) were created as a service to the community by Dan Georgescu fall, 2010.  Full resolution source images of each page of the Mikrogeologie are given in separate folders, while high quality single page images of the other publications are available at the Berlin-Brandenburg Akademie der Wissenschaft (www.bbaw.de).

- dave lazarus, Oct. 2010