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Presentations
(40)Documents
(1)Tags
environment
environmental education
history
nature
ecology
winter
art
writer
biology
science
ice
water
lakes
rivers
frost
chemistry
energy
solar energy
weather
global climate change
climate
global warming
snow
politcs
:earth day
forestry
management
natural history
boundary waters
wilderness
economy
alaska
minneapolis
wirth
parks
goodall
st. paul
zoo
al gore
earth day
literature
photography
biomes
plants
mammals
See more