Help with ND royalty assignment

I found an assignment of royalty in my mom’s old paperwork. It is from 1937 and purchased by my great grandfather. My mom said they’ve always been told it was worth nothing. I followed the advice of many here on other posts and called XTO who has a current permit in the area. They indeed had an account in suspense in my great grandfather’s name. The agent gave me the procedure to get this transferred to my mom and uncles names. The agent also told me the wells that were generating the money were in 2 different counties in ND—Wells and McKenzie—and they accessed my portion horizontally. Is this normal to be in 2 counties or should I be hunting for another royalty assignment? Should I also be checking with other companies other than XTO to see if someone else has funds in suspense?

I have a large folder with a lot of old documents but only one appears to be a true royalty document. The others are mining stock certificates. Thank you for any help. This is all foreign to me! We don’t have oil in Georgia :slight_smile: