Dr. Seuss books - set of 3 books pictured - 11x8.25 - excellent condition 1 mark

Dr. Seuss books - set of 3 books pictured - 11x8.25 - excellent condition. Purchased in the early 1990s - 1 owner. 1 mark on the inside cover of one book - see pics. No other flaws. Did I Ever Tell You How Lucky You Are? (Black pen mark on inside cover) (Random House) If I Ran the Zoo (Random House) And to Think That I Saw it on Melberry Street (Vanguard Press)