If you wish to refund what was paid then I can provide your funds back if:
Shipping shows it hasn't arrived (Can take up to 7 - 10 days to get to your location)
If it in incurs damage to the book that renders it unreadable.
I can assure when I ship them Iam very aware of the level of wear and tear the book may have on it and the has been reflected in the price I set. If a book is unreadable I will not sell it.
Prices are subject to change at my discretion.
Pretty simple. If you bought it's yours. If the book arrives in a state that you can't read it I'll discuss refunds with the purchaser.