User talk:103.219.236.9

April 2023
Hello, I'm Clyde H. Mapping. I wanted to let you know that I reverted one of your recent contributions—specifically this edit to Environmental engineering—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Teahouse or the Help desk. Thanks. Clyde H. Mapping (talk) 03:06, 11 April 2023 (UTC)