I found it online, and printed out the pages that have the info I need for my work as a reminder for filter factors and exposures. Another handy one is Kodak's Reference Handbook. I found the 1 from 1946, it includes images showing the range of several filters. I found both in a photography forum, unfortunately, I can't remember which one.

By using the first one, I can use it to calculate out proper exposure with my filters. As you said, no one using filters should be without one! (At least, when starting out, like me!)