Are Yu Xunling's works of great help to future generations in studying the history of Qing Dynasty?

Speaking of Yu Xunling, Yu Deling and Yu Rongling, the three of them are brothers and sisters. Yu Xunling is the elder brother of Yu Deling and Yu Rongling. Yu Deling and Yu Rongling are Yu Xunling's sisters. The three of them received a good education since childhood and were taken to France by their father to study and travel. When they grow up, the three of them have different development careers. My brother Yu Xunling's main job is photography. He was the first photographer in the Qing Dynasty. In addition to taking photos of Empress Dowager Cixi, he also took photos of members of the royal family. It is because of this achievement that Yu Xunling took many photos of the royal family at that time, so that we contemporary people have the opportunity to understand the face and life of Cixi and others at that time, which is of great help to understand history of qing dynasty. Yu Deling and her father have been to Japan and France, which broadened her horizons since she was a child. She is highly knowledgeable and can speak many foreign languages. At that time, few people had these skills, especially she knew a lot about some western cultural knowledge. After returning to Beijing, she was invited to the palace by Empress Dowager Cixi. A few years later, Yu Deling left the palace because his father was ill. Because she had lived in the palace and knew a foreign language, she lived in the United States after marrying an American. In her spare time, she writes about living in the palace. After the book was published, the popularity of her and Yu Xunling increased a lot, because she used many photos taken by her brother Yu Xunling in her articles. These precious materials are of great help to the study of the history at that time.