Tumanskiǐ was friendly with the Bahais, whom he first met in Ashgabat in 1890. He maintained close relationship with the Bahais in Central Asia and Transcaucasia, and he studied and translated Bahai works and literature. The most important publication of Tumanskiǐ in the field of Bahai studies was his translation (1899) of the Ketāb-e aqdas by Bahāʾ-Allāh (1817-92). Besides the Russian translation, the publication also contains the Arabic original and an introduction on 48 pages. An earlier publication of Tumanskiǐ (1892) deals with Bahāʾ-Allāh’s other work, Ketāb-e ʿahd. In his studies in the field, Tumanskiǐ corresponded with E.G. Browne (1862-1926). He offered significant assistance to the Bahai community in Russia, especially when the first Bahai temple was being constructed in Ashgabat (Ḥudüd al-ʿālam, pp. xlii-xliii). Tumanskiǐ translated into Russian the work Šajara-ye Tarākema (‘Genealogical Tree of the Turkmen’) of Abu’l-Ḡāzi Bahādor Khan of Khiva (1603-63). This translation was published in Ashgabat in 1897. Being a military man, he wrote a book entitled Military Art of the Ancient Arabs (1897).