SEO
The EPR Authority Index: 100 High-Authority Domains That Shape SEO, Reputation, and AI Visibility
The EPR Authority Index — a curated map of 100 domains across 13 categories that shape SEO, reputation, and AI visibility on the open internet. Grouped, not ranked. Government, knowledge, academia, research, news, technology, professional, commerce, community, data, legal, business, and vertical industry authorities.