- R for Conservation and Development Projects
- R3 y la Colmena Perdida
- R3 y la Huerta Mágica
- Rabbit
- Rabbits
- Rabbits in the Wild!
- Rabbits Can Be Your Kids' Next Best Friend!
- Rabbits for Kids
- Raben in Mythos und Kulturgeschichte
- Raccontami qualcosa di bello
- Racconti della Natura
- Racconti di ghiaccio e roccia
- Raccoon
- Raccoon Gangs, Pigeons Gone Bad, and Other Animal Adventures
- Raccoons
- Raccoons in Our Bathroom
- Raccoons Stole My Baby Jesus
- Race Against Mother Nature
- Race for Sustainability
- Race for Tomorrow
- Race France To France: Leave Antarctica To Starboard
- Rachel Carson
- Rachel Carson and Her Sisters
- Racionalidad ambiental
- Racks
- Radical By Nature
- Radical Joy for Hard Times
- Radical Simplicity
- Radical Transformation
- Radici e Rami
- RADICI LIQUIDE
- Radio Tracking and Animal Populations
- Radioactivity and Radiation
- Rafting the River of No Return Wilderness - The Middle Fork of the Salmon River
- Raftmates
- Rag and Bone
- Ragdoll Katzenerziehung - Ratgeber zur Erziehung einer Katze der Ragdoll Rasse
- Ragnarok : the Age of Fire and Gravel
- Ragni di Lecco
- Ragni, serpenti, scorpioni
- Railway Ecology
- Rain
- Rain Comin' Down
- Rain Forest in Your Kitchen
- Rainbow Gum's Gift
- Rainbows
- Rainforest
- Rainforest animals
- Rainforest Animals for Kids: Wild Habitats Facts, Photos and Fun Children's Environment Books Editi...
- Rainforest Babies
- Rainforest Critters
- Rainforest Tourism, Conservation and Management
- Rainforest Trails
- Rainforests
- 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
- Raised By Wolves
- Raising Backyard Chickens & Hens At Home
- 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
- Raleigh Raptors
- Raleigh Raptors Image Archive
- Rambla
- Rambles in Wonderland; or, Up the Yellowstone
- Ramblings Of A Charmed Circle Flyfisher
- Ranaviruses
- Ranch Life and the Hunting-Trail
- Ranch Tales
- Rancher, Farmer, Fisherman: Conservation Heroes of the American Heartland
- Ranching under the Arch
- Ranching, Mining, and the Human Impact of Natural Resource Development
- Random Notes
- Range Improvement in Arizona
- Range Investigations in Arizona
- Range Wars
- Rants from the Hill
- Rapaci
- Rapport sur une mission botanique exécutée en 1884
- Raptor Facts For Kids 9-12
- Raptor ID Videos
- Raptors
- Raptors In Human Landscapes
- Raptors of Mexico and Central America
- Raptors of the World: A Field Guide
- Rare and Exotic Orchids
- Rare Bird
- Rare Birds
- Rare, Vanishing and Lost British Birds
- Ras-le-bol des écolos
- Rascal and Bandit
- Rascals in Paradise
- Rasen und Wiesen im naturnahen Garten
- Rat Island
- Rat: How the World's Most Notorious Rodent Clawed Its Way to the Top
- Rating Agenturen
- Rats
- Ratten: Liebenswerte Riesenmäuse.
- Rattlers & Snappers
- Rattlesnakes
- Rattlesnakes And Venomous Reptiles
- 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's Witness
- Ravens in Winter
- Ravensong
- Ravine Lands: Greening for Livelihood and Environmental Security
- Ravished by Beauty
- Raw Deal
- Raw Veganism
- Rawls and the Environmental Crisis
- Re-Bisoning the West
- Reaching Across the Waters
- Reacting to Climate Change
- Reactive Transport in Soil and Groundwater
- Reader zum Transhumanismus
- Reading Nature Guide to the Deadly Snakes of South Africa
- Reading Shaver’s Creek
- Reading the Clouds
- Reading the Gaelic Landscape
- Reading The Trail
- Reading the Weather
- Reading Weather
- Reading Weather, 2nd
- Ready, Set, Green
- Real Alaska
- Real Treasure Hunting for Beginners
- Realising Farmers' Rights to Crop Genetic Resources
- Realising the 'Triple Dividend of Resilience'
- 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
- Rebhuhnfarbene Polnische Grünfüßler
- Rebuilding the Earth
- Recapture
- Recensement des vivipara du système européen
- Recent Advances in Earthquake Engineering
- Recent Advances in Environmental Management
- Recent Advances in Geo-Environmental Engineering, Geomechanics and Geotechnics, and Geohazards
- Recent Advances of Avian Endocrinology
- Recent Developments in Waste Management
- Recent Technologies for Disaster Management and Risk Reduction
- Recent Trends in Biotechnology and Therapeutic Applications of Medicinal Plants
- Recepte véritable
- Receptors as Supramolecular Entities
- Recepção, Emissão E Vice-versa
- Recettes de produits ménagers et cosmétiques
- Reciclar la ecología
- Recipe for America
- Reciprocity and China’s Transboundary Waters
- Reclaiming Food Security
- Reclaiming the Don
- Reclamation of Arid Lands