1972 Earl Daniels Print

Hello,

 I have a print of a 1972 Earl Daniels Yosemite falls that is 20x24. I was wonder the ball park range it sells for. I found it at a goodwill and it had the orignal order tag and number on the back dating 1972. It has a small amount of yellow from aging under the bottom frame and his name is printed in the bottom right corner. I read that when he had it printed he did not sign the prints. Some of the staples are coming out of the back of it due to age.