The listing, Collectible Pair of Happy Hollister Books from 1950's has ended.
Here you have The Happy Hollisters on a River Trip by Jerry West, published in 1953. It is in very good condition, but lacks the dj. The other is The Happy Hollisters and the Ice Carnival Mystery by Jerry West, published in 1958. It is in good condition, but lacking dj. It also has a loose back cover, where it detaches from the pages, but none of the pages are loose. It also has a small scuff on the back. The pages in both are yellowed, but of very good quality. They are children's chapter books of about 180 pages. They are about 4-6th grade level. They are still very readable.