An important Imperial album of minorities mark and period of Qianlong

ink and colour on silk, with 26 double leaf paintings, each vividly depicting in graphic detail, representing different minority groups, a man on the right and lady on the left in traditional dress, with inscriptions in Chinese and Manchurian script, each leaf mounted in silk, between hardwood covers and yellow paper with gold flecking, the cover incised with the title Zhigong tu, liu ce (Tribute Album, Volume Six), the inside front cover with two six-character Imperial sealmarks in red ink