- Ma forêt
- Ma la sabbia non ritorna
- Ma maison écolo - 365 réflexes verts au quotidien
- Ma quali mutamenti climatici
- Ma vie toute crue
- Ma vérité sur la planète
- Mach mich stark!
- Mach was draus
- Machias seal island
- Macho oder Mimose
- Mackó
- Macondo Well Deepwater Horizon Blowout
- Macroregión Fronteriza EEUU México
- Mad About Mushrooms
- Madagascar 1974, carnet 14
- Madagascar: The Land Amidst Moving Waters
- Made of Salmon
- Madeira
- Madhouse at the End of the Earth
- Madikwe, 2015
- Madikwe, South Africa
- Magdalena Mountain
- Maggie M. Manatee
- Maggie Marshmallow
- Magic Dolphin Medicine A-Z
- Magic In My Hands
- Magic Pause, Wind in the Ravine
- Magnitude 8
- Magpie Grows Up
- Mai gridare al lupo
- Mai più
- Maine Amphibian Songs
- Maine Coon - Wilde Schale weicher Kern
- Maine Coon Katzenerziehung - Ratgeber zur Erziehung einer Katze der Maine Coon Rasse
- Mainly About Wolves
- Majestic Journey
- Make Garbage Great
- Make it Wild!
- Make Prayers to the Raven
- Make Waves
- Make You Mine: Dumont Bachelors 1 (A sexy romantic comedy of second chances)
- Make You Remember: Dumont Bachelors 2 (A sexy romantic comedy of second chances)
- Make You Remember: Dumont Bachelors 2 (A sexy romantic comedy of second chances)
- Makers of the Environment
- Making a Garden
- Making and Unmaking of the San Francisco Bay
- Making Birdhouses
- Making Climate Action More Effective
- Making Electricity Resilient
- Making Global Trade Work for People
- Making Jeans Green
- Making Kind Choices
- Making National Energy Policy
- Making Sense of Nature
- Making Sense of Weather and Climate
- Making the Most of the Water We Have
- Making Waves
- Makybe Diva
- Malapolvere. Una città si ribella ai «signori» dell’amianto
- Malattie radicali del ciliegio
- Malawi Peacocks
- Maldesarrollo
- Maleika
- Malibu Burning
- Malleefowl
- Malmivaara
- Maltrato animal, sufrimiento humano
- Mama Keeps Some Sheep
- Mama Wants a Llama
- Mama's Medicines - Growing Your Backyard Apothecary
- Mammalia - Part II - The Zoology of the Voyage of H.M.S Beagle
- Mammalian Neuroendocrinology
- Mammals Guide Book - From A to F Mammals for Kids Encyclopedia Children's Mammal Books
- Mammals in the British Isles
- MAMMALS OF AFRICA
- Mammals of Canada
- Mammals of Mount McKinley National Park
- Mammals of Namibia
- Mammals of North Africa and the Middle East
- Mammals of South Asia-Volume One
- Mammals of South-east Asia
- Mammals of Sri Lanka
- Mammals of the African Savanna - Animal Book 2nd Grade Children's Animal Books
- Mammals of the Great Lakes Region, 3rd Ed.
- Mammals of the Osa Peninsula
- Mammals of Ungava and Labrador
- Mammals of Yosemite National Park
- Mammals, Amphibians, and Reptiles of Costa Rica
- Mammals: Animal Group Science Book for Kids Children's Zoology Books Edition
- Mammifères marins
- Mammoth Cave and the Kentucky Cave Region
- Mammoth Cave National Park
- Mamíferos: Elefante-africano
- Man and Birds
- Man And Environmental Processes
- Man and Nature
- Man and the Natural World
- Man and Wildlife
- Man Swarm
- Man Vs Animal
- Man vs. Nature : Controlling Forest Fires - Nature Books for Kids Children's Nature Books
- Man vs. Weather
- Man's Furry Best Friend: All about Dogs - Animal Book for Toddlers Children's Animal Books
- Man's War Against Nature
- Man-Eater Of Kumaon
- Man-Eaters
- Man-Made Catastrophic and Humongous Global Disasters
- Management of Hydrological Systems
- Managing a Global Resource
- Managing Adaptation to Climate Risk
- Managing Air Quality and Energy Systems
- Managing Ash from Municipal Waste Incinerators
- Managing Biological and Ecological Systems
- Managing Boreal Forests in the Context of Climate Change
- Managing Coal Combustion Residues in Mines
- Managing Complexity: Earth Systems and Strategies for the Future
- Managing Construction and Infrastructure in the 21st Century Bureau of Reclamation
- Managing Environmental Conflict
- Managing Forests as Complex Adaptive Systems
- Managing Global Resources and Universal Processes
- Managing Hazardous Air Pollutants
- Managing Human and Social Systems
- Managing Natural Resources for Sustainable Livelihoods
- Managing Natural Science Collections