https://zikaron-imports.s3.amazonaws.com/Lestchinsky1903/Lestchinsky1903 001.pdf
It is well-known that Lestchinsky wrote this anonymous article, which he notes on the first page that it was a study of his hometown. One source for this is Gur Alroey's “Demographers in the Service of the Nation: Liebmann Hersch, Jacob Lestschinsky, and the Early Study of Jewish Migration.” Jewish History, vol. 20, no. 3/4, 2006, p. 277