What are the works of calligrapher Xu Rongshuang? Is work valuable?

His representative works include International Calligraphy Collection, Selected Works of China Teenagers' Calligraphy, Panorama of Yellow River Mother's Calligraphy, Collection of National Calligraphy Masters, China Dictionary of Contemporary Calligraphers, Appreciation of Chen's Poetry, etc. One of his calligraphy works, 6 feet 290 thousand.