JeansZa - Levi's care instruction label since 1987-1994
Levi's - Check the care tag. It's sewn into every single pair of Levi's® jeans (and has been for the last 10 years.) It lists all the ways you can care for
Denim Care, an Expert Guide: How to Wash and Break in Jeans – Robb Report
Old Levi's care tag deciphering - DATES? | Vintage Fashion Guild Forums
How to wash and dry jeans - Denim Care Guide | Levi's® US