A - General Works = "A - Trabajos generales"
B - Philosophy, Psychology, Religion = "B - Filosofía, psicología, religión"
C - Historical Sciences = "C - Ciencias históricas"
D - World History = "D - Historia mundial"
E - United States History = "E - Historia de los Estados Unidos"
F - General American History = "F - Historia general americana"
G - Geography, Anthropology, Recreation = "G - Geografía, antropología, recreación"
H - Social Science = "H - Ciencias sociales"
J - Political Science = "J - Ciencias políticas"
K - Law = "K - Leyes"
L - Education = "L - Educación"
M - Music = "M - Música"
N - Fine Arts = "N - Finas artes"
P - Language and Literature = "P - Lenguaje y literatura"
Q - Science = "Q - Ciencia"
R - Medicine = "R - Medicina"
S - Agriculture = "S - Agricultura"
T - Technology = "T - Tecnología"
U - Military Science = "U - Ciencias militares"
V - Naval Science = "V - Ciencias navales"
Z - Library Science = "Z - Ciencias bibliotecológicas"