Related Items?

I know that the money to run this site has to come from somewhere and I do not have any problem with the adds along the side of the page, but how exactly is "Defect and Microstructure Analysis by Diffraction (International Union of Crystallography Monographs on Crystallography, 10)" related to Halo? I have seen other books such as one about moding an xbox and that makes perfect sense, but who gets to decide what products are advertized? To whoever it is, "Defect and Microstructure Analysis..."

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