Wikipedia:Key searches

This is a list of key data sets which should be searched by editors either generating content, or making any, but in particular significant, changes to content, especially for example when proposing or nominating articles for deletion.

The criteria for in inclusion in this list are, the data set or search must: It would be expected that no more than two or three list entries per type / category / country would meet the criteria.
 * be freely available
 * have either national recognition or essentially universal subject area recognition
 * have high quality management standards