Wash by T.a. McMichael, pastel and graphite on artist paper, signed and dated 1970, framed - 29" x 37"
 
I'm unclear as to who the artist is. However, it's possible that its T.A. McMichael (Terree April McMichael) (Oklahoma, 1944-2023), who was an artist and art teacher in Apache, Oklahoma that exhibited in local museums and galleries.