↑‘カラフトナヨロ惣乙名文书’第二文书 北海道大学付属図书馆蔵 乾隆四十年三月二十日(1775), Karafuto Nayoro Documents, No.2 Document (In Manchu language), a document in which a Chinese Qing Dynasty local official (the Deputy lieutenant-general of Ningguta) urged the Sakhalin Ainu chief to tribute.