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			It looks to me as if the problem is that the No. of books field has been created as a string, i.e. No. books appended with the word 'Book'/'Books'. Hence the alpha- rather than numeric-sort. 
 
You have to wonder how experienced these programmers are. I'm fairly sure I'd got this schoolboy(girl) error knocked out of me during my trainee programmer phase.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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