Mepụta ụdị nke ahịrịokwu a nke dị mgbagwoju anya Gilmore na onye otu ya bụ Norman H. Boss, onye mechara bụrụ onye isi nhazi na ụlọ ngosi ihe mgbe ochie, jikọtara'' Edmontosaurus'zuru ezu na 1903.
N'ezie, ụdị nkebi ahịrịokwu ahụ dị mgbagwoju anya bụ "Gilmore na onye ibe ya bụ Norman H. Boss, onye mechara bụrụ Onye Isi Nhazi na ụlọ ngosi ihe mgbe ochie ahụ, jikọtara ọnụ wee wuo ọkpụkpụ 'Triceratops' mbụ nke ụwa, nke gara n'ihu na 1905. "