The 1890 US census was almost destroyed by fire. Here's what happened and what 1890 census substitute records are available.
Us census of 1890 hi-res stock photography and images - Alamy
The changing categories the U.S. census has used to measure race
First in the Path of the Firemen”
Destruction of the 1890 Census - The official blog of Newspapers.com
1900 Census, 1900 US Federal Census Records
The 1890 US Census aka the Knife Twister : r/Genealogy
Who are You Made Of? - Page 9 of 67 - Use Your Unique DNA to Find Your Roots
Thousands of 1890 Census Records DO Still Exist: Here's How to
Online Classroom
Genealogy Q&A: Researching Census Records