Arbeitsbuch of the " Freie Stadt Danzig".  It was issued to  Herta Schaefer, born on the 18th of June 1890. The workbook was issued on the 6th of September 1939. It seems that she worked for the city of Danzig itself (Personalamt and Fürsorgeamt).
 
condition:  cover page has been perforated, otherwise very good condition.