If you want to search for any word in the SMS website do an advanced search with Google or Yahoo as follows:

Open https://www.google.com or https://www.yahoo.com.

Enter your desired word XYZ followed by site:https://angeles.sierraclub.org/skimt

It will open every file containing the word XYZ in the SMS website.

Example: Click on Baldy to find every file containing it.

Still faster, click on Baldy and replace the word Baldy with your desired word.