This is the characteristic resource library of Guo Tu's doctoral dissertations. You can only read the first 24 pages due to copyright issues. If you need to view the full text, you need to go to the library.

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The Doctoral Dissertation Hall of the National Library (Room 2 18, second floor west) is available for reading. Contact information is as follows:

E-mail :xwlwzx@nlc.gov.cn

Tel: (010) 88545465; 687 16447 (fax)

Address: Doctoral Dissertation Group of National Library, No.33 Zhongguancun South Street, Beijing

Postal code: 10008 1