Columbia subject headings:
Inventions--History--Miscellanea.
Specialists--Miscellanea.
Technology--History--Miscellanea.
Trivia and miscellanea.
Harvard subject headings:
Inventions--History--Miscellanea.
Specialists--Miscellanea.
Technology--History--Miscellanea.
Trivia and miscellanea
Princeton subject headings:
Inventions--History--Miscellanea.
Specialists--Miscellanea.
Trivia and miscellanea.