Diary of Joseph F.C. Rock Volume 12 [13 on spine]; Yung-ning to Ta-tsien-lu [Kanding], 1929 entitled 'Diary of Joseph F. Rock, Volume XII, from February 13th 1929 to June 3rd 1929.
Contains loose notes and maps.

Diary of Joseph F.C. Rock Volume 13 [14 on spine]; Minya Konka to K’u-lu and Yung-ning, 1929 entitled 'Diary of Joseph F. Rock, from June 5th 1929 to August 31st 1929, Volume XIII [scored out] XIV'.
Some of the pages contain hand drawn maps.