Columbia subject headings:
Comic books, strips, etc.--United States.
Graphic novels.
Human-alien encounters--Comic books, strips, etc.
Life on other planets--Comic books, strips, etc.
Science fiction comic books, strips, etc.
Whales--Comic books, strips, etc.
Harvard subject headings:
Comic books, strips, etc.--United States.
Graphic novels
Human-alien encounters--Comic books, strips, etc.
Life on other planets--Comic books, strips, etc.
Science fiction comic books, strips, etc.
Whales--Comic books, strips, etc.
Princeton subject headings: