Looks like a few Trappers, a Sodbuster, and a couple of stockmen, and a Barlow, all appearing to have condition issues. The exact pattern numbers should be stamped on each knife as none appear to be old enough to be from the pre-pattern number era. You should also be able to date them from the tang stamps. Up at the top of the page, click on Research, https://www.allaboutpocketknives.com/page/research.php
. That will take you to the section where you can find what you seek. Scroll down to the section on Case, which is where you can find dating and pattern identification information.
Once you’ve identified the pattern and age you can find value from comparable sales on eBay. As redryder said, condition is paramount in determining value, so you’ll need to adjust accordingly for each knife versus what you find on eBay.