Monarch Joint Venture
MJV has a variety of free downloads, including Milkweed Information Sheet, Gardening for Monarchs, School Butterfly Gardens, Migration Map, Citizen Science and many more. Some of these even have Spanish versions.
http://www.monarchjointventure.org/resources/downloads-and-links/
Pollinator Partnership
Great brochures on a variety of topics related to pollinators. Examples include: Your School and Pollinators, Protecting Pollinators, Inviting Bees to Your Property-No Fear of Stings, Protecting Monarchs and many more.
http://pollinator.org/brochures.htm
Observe, Describe, Wonder
A Journey North guide to support teachers in building inquiry into instruction.
https://journeynorth.org/tm/inquiry/inquiry_guide.pdf
Schoolyard Habitat Project Guide
A planning guide for creating schoolyard habitat and outdoor classroom projects developed by the U.S. Fish & Wildlife Service.
https://www.fws.gov/sites/default/files/documents/FWS-Schoolyard-Habitat-Guide_0.pdf