There are specialized books containing thousands of spectra. They are usually organized per class of compounds, for instance barbituratures, benzodiazepines, etc.
Aside that, there is also the scientific journal. My guess is you have to look for toxicological literature from the 70s-80s. UV spectrophotometry was much more common as confirmation tool in those days as it is today. Many labs didn't have these robust 5 m^3 MS in the days...