Joel's Hierarchical Subject Index
Philosophy,
Mathematics,
Cybernetics,
Library Science,
Rhetoric,
Education
Agriculture,
Forestry,
Architecture,
Material Science,
Transportation,
Computers,
Construction
Business and Commerce,
Law,
Politics,
Government,
Sociology,
Economics,
Linguistics,
Recreation,
History,
Geography-Humans on the Earth
Christianity,
Judaism
Physics,
Chemistry,
Geology, Atmospherics, and Hydrology,
Biology
Collections,
Humans as Medium,
Humans as Artist