Flora and Fauna Books  
   Specializing in natural history and related scientific subjects as well as art and human history books.
   http://www.ffbooks.com/

NHBS  
   Online natural history, environment and science bookstore.
   http://www.nhbs.com/

2Neat Books  
   Specializes in USGS professional papers, offprints of scientific publications and magazines.
   http://woodenski.com

Frank Mikesh Natural History Books  
   Rare and out-of-print natural history, hunting, and fishing books, as well as wildlife art books.
   http://www.netvista.net/~natscibooks/

Sapsucker Books  
   Catalog of used, out-of-print, hard-to-find, and selected new natural history books.
   http://www.sover.net/~sapsbks/

North Woods Field Guides  
   Educational field guides for the identification of animal tracks, trees, wildflowers, and constellations.
   http://www.northwoodsguides.com

AGU Book Catalog  
   Books available from the American Geophysical Union
   http://www.agu.org/cgi-bin/agubookstore

Double Decker Press  
   Road guides to National Parks in the western U.S. and Hawaii.
   http://www.doubledeckerpress.com

Ed Rogers Rare and Out of Print Books  
   Used geoscience books for sale.
   http://www.geology-books.com/

Geological Society Web Shop  
   Publications from the Geological Society of America.
   http://bookshop.geolsoc.org.uk

GeoScience Books  
   A variety of geoscience books for sale, including bargain books.
   http://www.geosciencebooks.com/

Green Nature Books  
   Supplier of quality nature books on tortoises, turtles, orchids and other books by Richard Cary Paull.
   http://www.greennaturebooks.com/

WMNH Giftshop  
   Geology books, slides, and prints available from the World Museum of Natural History giftstore.
   http://www.wmnh.com/wmgspub.htm

Subbuteo Books  
   Provider of natural history and wildlife books, maps, videos, compact disks and cassettes.
   http://www.wildlifebooks.com

Watered-Down Electricity  
   Information, text and graphics about electricity.
   http://www.sykart.com/keenie/electron/

Earth Science Books  
   Used and rare geology and paleontology books, many with a British focus. Ordering from pdf format catalogs.
   http://www.earthsciencebooks.com/

PaleoPublications  
   Used, some rare, works in Paleontology, Geology, Mineralogy, and related subjects.
   http://www.paleopubs.com/

Classey Books  
   A variety of natural science books from a bookstore in Oxon, UK.
   http://www.classeybooks.com/