sentences:  By this time the Moscow Archaeological Society undertook research on the subject, formalising it as a field of study.A series of triennial conferences was instituted from 1869 to 1915, and its reports included studies of the architecture of the Kievian Rus' and early Moscow periods.Perhaps the Society's most significant achievement was the publication of the "Kommissii po sokhraneniiu drevnikh pamyatnikov" in 6 volumes between 1907 and 1915.