I've done some research, and I've heard about majoring/minoring in English, journalism, and communications. I really want to work as a copy-editor in a book publishing company, not on newspapers or magazines. Is the journalism major/minor necessary?

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I know that some colleges (or I suppose community colleges in the US?) have dedicated Editing programs, but I think Journalism is a good avenue as well.

Journalism and English. Most of your English courses will be lit, but take as much composition and grammar courses as possible.