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Most reference data has been taken from:
Chickos, J. S., Acree, W. E., "Enthalpies of Sublimation of Organic and
Organometallic Compounds. 1910-2001" J. Phys. Chem. Ref. Data 31 537:698 (2002).
In a few cases, heats of sublimation have been calculated from the published
heats of formation of the crystal and the gas phase form of a compound.