Publisher’s note: “The names of the streets were therefore inscribed in all three languages, but now they are only written in Lettish or Estonian, as if none but Letts or Ests were living in the country!” Heyking, Alfons. The main issues confronting the minorities of Latvia and Eesti. London: P. S. King , 1922, page 22.
Images (except the first four documents) courtesy of Victor Gushchin, PhD. An example of another relevant document: https://www.instagram.com/p/BVIo14Ogfi3/
Publisher’s note: many more relevant documents can be found at www.russkije.lv , some (more about the imperial times) at www.lvmz.lv See also https://www.instagram.com/p/BkQqXwlH7t0/ and https://www.instagram.com/p/Bn67VDsH4f9/