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Library of Congress Subject Areas
(1190)
L Education
(5)
L Education (General)
(5)
P Language and Literature
(1)
PE English
(1)
Q Science
(4)
QA Mathematics
(4)
QA75 Electronic computers. Computer science
(1)
QA76 Computer software
(4)
S Agriculture
(1)
S Agriculture (General)
(1)
T Technology
(1184)
T Technology (General)
(3)
TA Engineering (General). Civil engineering (General)
(2)
TD Environmental technology. Sanitary engineering
(1)
TH Building construction
(1)
TJ Mechanical engineering and machinery
(433)
TK Electrical engineering. Electronics Nuclear engineering
(485)
TR Photography
(1)
TS Manufactures
(274)