- R for Conservation and Development Projects
- R3 y la Colmena Perdida
- R3 y la Huerta Mágica
- Rabbit
- Rabbits in the Wild!
- Rabbits Can Be Your Kids' Next Best Friend!
- Raben in Mythos und Kulturgeschichte
- Racconti della Natura
- Racconti di ghiaccio e roccia
- Raccoon
- Raccoon Gangs, Pigeons Gone Bad, and Other Animal Adventures
- Race Against Mother Nature
- Race for Sustainability
- Race for Tomorrow
- Racionalidad ambiental
- Racks
- Radical Joy for Hard Times
- Radical Simplicity
- Radici e Rami
- RADICI LIQUIDE
- Radio Tracking and Animal Populations
- Raftmates
- Ragdoll Katzenerziehung - Ratgeber zur Erziehung einer Katze der Ragdoll Rasse
- Ragnarok : the Age of Fire and Gravel
- Ragni, serpenti, scorpioni
- Rails
- Rain
- Rain Forest in Your Kitchen
- Rainbow Dust
- Rainbows
- Rainforest animals
- Rainforest Animals for Kids: Wild Habitats Facts, Photos and Fun Children's Environment Books Editi...
- Rainforest Critters
- Rainforest Tourism, Conservation and Management
- Rainforest Trails
- Rainwater Harvesting for Drylands and Beyond, Volume 1, 3rd Edition
- Rainwater Harvesting for Drylands and Beyond, Volume 2, 2nd Edition
- Rainy Days for the Harpers Girls
- Raising Chickens in Your Backyard
- Raising Chinchillas For Profit
- Raising Goats for Beginners
- Raising Goats: A Step-by-Step Guide to Raising Healthy Goats for Beginners
- Raising Small Livestock
- Raising Thunder
- Raising Working Dog Puppies
- Rambla
- Ramblings Of A Charmed Circle Flyfisher
- Ranching, Mining, and the Human Impact of Natural Resource Development
- Rants from the Hill
- Rapport sur une mission botanique exécutée en 1884
- Raptor
- Raptor Facts For Kids 9-12
- Raptor ID Videos
- Raptors In Human Landscapes
- Raptors of Mexico and Central America
- Raptors of the World: A Field Guide
- Rare Birds
- Rare, Vanishing and Lost British Birds
- Rascal and Bandit
- Rascals in Paradise
- Rasen und Wiesen im naturnahen Garten
- Rattlers & Snappers
- Rattlesnakes
- Raven
- Raven and Duck
- Raven and Frog Count
- Raven and the Box
- Raven Makes a Necklace
- Raven Sings the ABC’s
- Raven Walks Around the World
- Raven Sings the ABC’s
- Raven Walks Around the World
- Ravensong
- Ravished by Beauty
- Raw Deal
- Raw Veganism
- Rawls and the Environmental Crisis
- Re-Bisoning the West
- Reacting to Climate Change
- Reading Nature Guide to the Deadly Snakes of South Africa
- Reading the Clouds
- Reading the Gaelic Landscape
- Reading The Trail
- Reading the Weather
- Real Dirt
- Real Treasure Hunting for Beginners
- Realising Farmers' Rights to Crop Genetic Resources
- Realistic Origami Animals
- Reality Check
- Reality of God's Existence
- Realizing Community Futures
- Really Yucky Stuff (That's Gross Volume 2)
- Reason in a Dark Time
- Reason, the Only Oracle of Man
- Rebecca's Trail
- Recapture
- Recensement des vivipara du système européen
- Recent Advances in Environmental Management
- Recent Advances of Avian Endocrinology
- Recepte véritable
- Receptors as Supramolecular Entities
- Recepção, Emissão E Vice-versa
- Recettes de produits ménagers et cosmétiques
- Recipe for America