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Hackett went out as lieutenant in Col. J. A. Gilmore's Artillery brigade, which was disbanded before reaching South America. The writer did not see any actual service, but his Narrative gives account of several British expeditions of 1817

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Mode of access: Internet.

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At head of title: Non-partisan, non-profit.

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"Prepared in part under contract 68-01-3255, task 3."

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The relation between the fragility of glass-forming systems, a parameter which describes many of their key physical characteristics, and atomic scale structure is investigated by using neutron diffraction to measure the topological and chemical ordering for germania, or GeO2, which is an archetypal strong glass former. We find that the ordering for this and other tetrahedral network-forming glasses at distances greater than the nearest neighbor can be rationalized in terms of an interplay between the relative importance of two length scales. One of these is associated with an intermediate range, the other with an extended range and, with increasing glass fragility, it is the extended range ordering which dominates.