Several thousand index cards containing abstracts of papers dating from 1852 to 1969 had earlier been archived in the NIST Thermochemistry Data Center. Values reported in these abstracts guided the extraction of data from the original paper. Papers before 1946 have not yet been processed. In cases where a single measurement was reported in several papers, only the original is reported. If the value was corrected in a later work, this is noted in the comments.
Significant work remains in eliminating multiple entries originating from a single determination.
Efforts were made to correct all mathematical mistakes in the derivation of enthalpy of formation from measured data. Any exceptional features of a reported value is noted in the comments. Values for cases where there is an unexplained large discrepancy between a reported value and other seemingly reliable value are given in brackets. Our present objective is simply to accurately record the original data. Moreover, the present version is not yet complete and inconsistencies are still being discovered and corrected.