Ziegler, "The New Spirit of Military Education," "Friends of Europe" Pub., Westminister, London, No.25, 1935 Box 11, Folder 37
ZIEGLER, THEOBALD*. 1 ALS, 1 ANS, Strassburg, 15 December 1908 and 26 December 1908 Box 36, Folder 48
ZIEHN, BERNHARD (1845-1912). 1 ALS, Chicago, together with 1 printed flier on Ziehn's Harmonie - und Modulationslehre . 1 ALS, Chicago, 16 April 1902 24 May 1902 Box 36, Folder 49