Is the preface of Xie Mingfu's works valuable?

Worth some money. Xie Mingfu is a famous calligrapher in China. His work "Blue" is vivid and praised by many calligraphy experts. It is very valuable and can be used as a collection of handicrafts. Xu Lanting's position in the history of calligraphy lies not only in his calligraphy attainments, but also in Wang Xizhi's unparalleled personality charm and life philosophy revealed by the contents of the article.