Quote:
Originally Posted by kamizase
6 inchers are 3.6 inch wide. This is 9.144 cm. So without margins on the text a 6" offers exactly what you want.
Booxtor reports you can set two columns in landscape mode. So that is 2 times (almost) 4" wide, with some space to seperate the pages it also gives you what you want, this time in 9.7" format. 
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Not all the books have the text on two columns. Scientific materials especially Maths , Physics and so on use one column.
Medical books seem to prefer two columns.