Romansh language published in 1703, though either the Catholic variety of Sursilvan or Putèr was more commonly used there until the 20th century. In the 16th century, the language border between Romansh and German largely stabilized, and it remained almost unchanged until the late 19th century. During this period, only isolated areas became German-speaking, mainly a few villages around Thusis and the village of Samnaun. In the case of Samnaun, the inhabitants adopted the Bavarian dialect of neighboring Tyrol, making Samnaun the only municipality of Switzerland where a Bavarian dialect is spoken. The Vinschgau in South Tyrol was still Romansh-speaking in the
Romansh language by 1928, when the "Pitschna introducziun a la nouva ortografia ladina ufficiala" by Cristoffel Bardola was published. A separate written variety for Sutsilvan was developed in 1944 by Giuseppe Gangale. Around 1880, the entire Romansh-speaking area still formed a continuous geographical unit. But by the end of the century, the so-called "Central-Grisons language bridge" began to disappear. From Thusis, which had become German-speaking in the 16th/17th century, the Heinzenberg and Domleschg valleys were gradually Germanized over the next decades. Around the turn of the century, the inner Heinzenberg and Cazis became German-speaking, followed by Rothenbrunnen, Rodels, Almens, and Pratval, splitting