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About Vs On



What is the difference between 'a book about Cambodia' and 'a book on Cambodia'?

About is usual when the information given is more general or the communication style is more casual. 

On is used to suggest that a book, lecture, article and so on is serious or academic and/or suitable for specialists. 

Compare the following examples: 

- A book on Cambodia history Vs a book for visitors about Cambodia and its people

- A textbook on economics Vs a conversation about finance

- An article on French industrial problems Vs an argument about strikes



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