It wasn't until about 1800 that standard German became an accepted written form of the language for government communications. Over the next 100 years, the standard German language spread throughout the country. More and more townspeople began to speak it, and it became the language of choice for the written word. From 1852 to 1860, the Brothers Grimm wrote and released a 16-part German dictionary. To this day, it remains the most comprehensive dictionary of the German language. Also in 1860, grammatical and orthographic (spelling and writing) rules were published in the Duden Handbook, and in 1901, this was declared the definitive guide to the standard German language.