Most of the time, what we may think has a real value, really does not. Enjoy reading teh paper articles , then remove.
I would remove the newspaper by spreading the quilt on a white sheet on the floor, spray with warm water a small area at a time and continue until all the paper is removed.
I would then soak the quilt top in the tub with a mild soap, rinse in cold water, hang to dry or dry on delicate. Iron the seams well.
The third quilt looks like all mens shirt fabrics. I do not see flour-
sack fabric.
The others appear to be fabric of that era. May or may not be floursack.
Choose fabrics for finishing that correspond with what is already in the quilt. This is not the time to get fancy and overdo it.
Likewise, keep the handquilting to the period. You will do fine. The couple put their trust in you to finish appropriately. BTW - did you do a contract? Just because he is a doctor does not mean everything will be hunky dorey. Take pictures for future reference.