Title: Zhu Jun, Bi Yuan, Ruan Yuan san jia mu fu yu Qian Jia bei xue
Subjects: Chinese Calligraphy, History, Ming-Qing dynasties
People: Yun Zhu (1729-1781), Yuan Bi (1730-1797), Yuan Ruan (1764-1849)
Time periods: Ming-Qing dynasties, 1368-1912