now the slopes of the river valleys are well covered with deciduous trees. Cottonwood, elm, and some oak and walnut are found along thebluffsof eastern Nebraska, while conifers grow in the Wild Cat and Pine Ridge highlands and the Niobrara valley. The Nebraska National Forest in west-central...
walnut, hickory, oak, and pine; today it is dominated by oak,yellow poplar, ash, and some pine. In western Maryland the pattern was pine and chestnut on hilltops, with oak, poplar, maple, and walnut in the valleys; now the mountains and valleys are forested by oaks and other hardwoods...