The YEAH External Page Number Index is designed for cases where you cannot use the internal links in YEAH.PDF to go to the topics you want. You can look a topic that interests you in this index and then manually go to the corresponding page in YEAH.PDF as long as your platform supports page navigation (not all do).
View the YEAH External Page Number Index
If you only see the first roughly 150 rows, tap the icon that appears to get a prompt to install the Google Sheets app. Install it (a very quick process) and you will see all the rows.