There are a number of approaches to locating archived data. If you know what type of information (subject, source, etc.) that you're looking for, then you can go directly to one of the subject-focused resources on this page. If you're unsure of where the data might have originated, you can search the more general and/or comprehensive resources. And if you want to look at data from a specific source at a specific time, you can use the resources and techniques listed here.
Search Engines, Aggregators, and Tools for Working with Archived Data