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Books about Yonglu:
Wang Yonglu Paintings(Chinese Edition) by BEN SHE (Jan 1, 2000)
Wen Yonglu festschrift (2003 India India amount: 500)(Chinese Edition) by BEN SHE.YI MING (Jan 1, 2000)
Wiki information Yonglu:
Yonglu was the son of the Qianlong Emperor.