dewey-ones:"320 - Political science" dewey-ones:"330 - Economics" dewey-ones:"333 - Economics of land & energy" dewey-ones:"380 - Commerce, communications & transportation" dewey-ones:"600 - Technology" dewey-ones:"620 - Engineering & allied operations" dewey-ones:"700 - The arts; fine & decorative arts" dewey-ones:"900 - History & geography"