A more recent copy of Mission of Gravity by Hal Clement - Aaron's Book of the Week (see previous post) – resides on my bookshelf. It's a 1978 paperback from Ballantine Books with a cover price $1.75 and cover art by H.R. Van Dogen.
Mission of Gravity is an acknowledged science fiction classic. It's set on the high gravity planet of Mesklin, which is home to intelligent, caterpillar-like aliens. The cover art on my edition apparently depicts some of these aliens.