This release includes the labeled data, digitization report, method keys, and partial reference keys as part of the IUPAC Digitized pKa Dataset. This is the first release of this dataset. The detailed process of digitization and curation of this dataset can be found in the IUPAC pKa Data Digitization Report attached in this repository. Our validation process is ongoing and will continue. Please be advised that a few errors and inconsistencies may still exist. The digitized books in this collection include: Serjeant: International Union of Pure and Applied Chemistry, E. P Serjeant and Boyd Dempsey. Ionisation Constants of Organic Acids in Aqueous Solution; Oxford/Pergamon, 1979 (Oxford IUPAC chemical data series) Perrin: International Union of Pure and Applied Chemistry, DD Perrin. Dissociation Constants of Organic Bases in Aqueous Solution; Butterworths, 1965