Are Liu Zongjian's calligraphy works valuable?

Worth some money. Liu Zongjian's calligraphy works are characterized by vigorous, skillful and rigorous, which have been recognized by the society and promoted the true biography of my father's calligraphy. He is also a member of China Guobai Juyi Calligraphy and Painting Research Institute and Luoyang Poetry and Painting Research Institute, which further enhances his popularity and influence, so Liu Zongjian's calligraphy works are precious.