Y Classification

Y11-Y91 General. Administration. Organization. Catalogs
Yb Biography. Collective 
Yc Biography. Individual
Yd  History and description 
Ye  Student life and customs 
Yg Undergraduate publications 
Yh   Alumni activities 
Yj   Freshman year
Yja    Yale College 
Yjb Sheffield Scientific School
Yjc - Yjp Professional schools, including Graduate School (Yjf) 
YL - Yn   Departments and institutions, including libraries (Yna - Ync) 
Yp Allied organizations 
Yr   Miscellaneous memorabilia 
Ys - Yzz9 Writings by Yalies, Institutions and periodicals with which Yalies are connected