The new species, named Tyrannosaurus mcraeensis, was uncovered in the Hall Lake Formation in New Mexico.
Nick Longrich - Blog
Fossil Find Challenges Theories on T. Rex - The New York Times
Tyrannosaurus rex / Useful Notes - TV Tropes
New Mexico scientists study fossil of T. rex relative found near Farmington
Nick Longrich - Blog
Tyrannosaur, Size, Species, & Facts
A giant tyrannosaur from the Campanian–Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism
Fossil found in New Mexico is an older, more primitive relative of T. rex
Researchers identify fossil unearthed in New Mexico as an older, relative of T-Rex
Closest relative of Tyrannosaurus rex discovered in New Mexico - Study Finds
Tyrannosaurus - Wikipedia
T. rex's older, equally hulking relative found in New Mexico
Touring exhibition: Tyrannosaurs - Meet the Family - The Australian Museum
Major Groups of Dinosaurs - Fossils and Paleontology (U.S. National Park Service)