Yes, it's free. According to the official website of Zhongshan Library in Guangdong Province, we can download e-books for free. Guangdong Provincial Zhongshan Library is located at No.213, Wen Ming Road, Yuexiu District, Guangzhou, and was founded at 19 12. Formerly known as "Nanyuan", it was a famous scenic spot in Yangcheng in Ming Dynasty, and later it was the library of Guangya Bookstore in Qing Dynasty. "Anti-wind Pavilion" is a revolutionary activity of Sun Yat-sen in his early years.