Among the Harvard-Yenching Library's precious Chinese books there are around 1,400 Sung, Yuan and Ming dynasty publications. Ching imprints (up to the Chien-lung period, 1736-1796) are most, numbering some 2,000. If you count them by volume, then there are around 40,000 books.
目前燕京所藏中文善本，宋、元、明版加起來共約一千四百種，精版（至乾隆朝止）最多，約二千種，若以冊計，則共約四萬冊。