An Atlas of the Sand Hills (RA-5b): 260 pp., size 8.5" x 11". Bleed, A. S., Flowerday, C. A., 1998. Description: The 19,300-square-mile Sand Hills region is the largest sand-dune area in the Western Hemisphere. The large sand masses were formed by blowing sand during the last 8,000 years or less. The climate ranges from subhumid in the east to semiarid in the west. Although most of the species do not originate there, the mixture is distinctive because the area is an ecological meeting ground, creating distinctive biological communities. This atlas examines the Sand Hills' natural history in detail, richly illustrated in more than 200 full-color photographs and maps, charts and diagrams. Subjects examined include climate; geology; soils; groundwater; streams; lakes and wetlands; introduction to plants and animals; plants; insects; fishes; amphibians and reptiles; birds; mammals; anthropology; land development and use; range management; and mineral resources. he Groundwater Atlas of Nebraska(RA-4b/2013), Jesse T. Korus, Leslie M. Howard, Aaron R. Young, Dana P. Divine, Mark E. Burbach, J. Michael Jess, and Douglas R. Hallum with contributions from R.F. Diffendal, Jr. and R.M. Joeckel. Edited by R.F. Diffendal, Jr. Description: 64 pp, full color publication with 42 maps and figures.