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In today's online world, do books still have a part to play? Absolutely!
Books can provide you with reliable information you can count on and include in your works cited/reference page. They often provide:
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The Library of Congress classification for HVAC is TH. More specifically, TH is broken down as follows:
H Social Sciences
K Law (as it pertains to the Building and Construction Industry)
L Education
N Fine Arts
R Medicine
S Agriculture
T Technology
U Military Science
Z Library Science