We may not have all of the resources that they list, but we will have some. Let me know if you need assistance with this.
Locating Primary Research - Physical Constants
Use the Journal Titles link to search for these journals. When you search within these journals, or narrow down by citation, you will find the primary research that led to the discovery of these physical constants.
Journal of the American Chemical Society: CASSI abbreviation: J. Amer. Chem. Soc.
Canadian Journal of Chemistry: CASSI abbreviation: Can. J. Chem.
Journal of Physical Chemistry: CASSI abbreviation: J. Chem. Phys.
Journal of Chemical Education: CASSI abbreviation: J. Chem. Ed.