Question:
Where was Harold Scott MacDonald Coxeter educated in Jul, 1928?

Context:
 Harold Scott MacDonald Coxeter attended University of Cambridge from Jan, 1928 to Jan, 1931. 
 Harold Scott MacDonald Coxeter attended Trinity College from Jan, 1926 to Jan, 1928. 
 Harold Scott MacDonald Coxeter attended Princeton University from Jan, 1931 to Jan, 1933. 
 Harold Scott MacDonald Coxeter attended Marlborough College from Jan, 1923 to Jan, 1925.

Answer:
University of Cambridge