 In 1902, Andreev drove through Osh to the Pamirs, to Vakhan, Ishkashim and back.The result of the trip was a scientific joint publication with Polovtsov on the ethnography of the Ishkashim and Vakhan tribes.During the trip and during his stay in Tashkent after, Andreev managed to collect data on the Yazgulyam language, which was then extremely obscure and almost unknown.