Doonesbury by Garry Trudeau for November 19, 1971
Transcript:
B.D.: O.K., let's go for the long bomb. I'll throw to "The Tree." Tree: Excuse me, B.D.? B.D.: Yes, "The Tree"? Tree: "The Tree." Appropriate nomenclature for the towering tight end...his stature reacing up into the sky like the sturdy oak....his limbs, tough gnarled, and sinewy, not unlike those of the magnificent elm...his feet, firmly rooted in the ground for perfect balance, his face, wooden showing no emotion at times of crisis! B.D.: "The Tree" is sometimes apprehensive that we won't know why he's called "The Tree."