M - Music 3,917
ML - Literature on Music 2,541
MT - Instruction and Study 1,356
LC - Social Aspects of Education 12
F - General American History 4
PS - American Literature 4
C - General History 3
HE - Transportation and Communications 2
Z - Books and Writing 2
D - General History 1
E - United States History 1
JK - United States 1
PN - General Literature 1
PT - European, Asian and African Literature 1
PZ - Fiction 1
UC - Maintenance and Transportation 1