Japanese translation: "On" designates a book that is more academic than "about" does.
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:
a book about Africa/a book on Africa
"On" designates a book that is more academic than "about" does.
Explanation: A book on Africa designates more of an academic book whereas a book about Africa can cover books that are non-academic.
Thank you for giving me the chance to look it up. I wasn't that sure about the differences either until I looked under "on" which explained the difference between on and about regarding books. If you have the 6th edition of the same dictionary, you can find your answer on the left side of page 1250, second line from the bottom.