A comprehensive work on the Slovak-Rusyn border issue by the Czech ethnographer, dialectologist and sociologist Dr. Jan Húsek. The author combined his own findings produced during expeditions in 1922 and 1923 with contemporary scientific knowledge from a wide variety of disciplines. Slovaks and Rusyns are compared through the lens of history, religion, language, physical traits, ethnography, folk culture, economics, social behavior and identity. The author identifies several entangled and dynamic identities without clear geographic lines. The work was received with great interest and was used by all parties to the debate to suit their own needs.