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More by Jim Ollhoff

Icon image World in Crisis

World in Crisis

Icon image Geothermal, Biomass, and Hydrogen

Geothermal, Biomass, and Hydrogen

Icon image Nuclear Energy

Icon image Fossil Fuels

Icon image Wind and Water

Icon image Wind and Water

Icon image Fossil Fuels

Icon image Police

Icon image Hazmat

Icon image Firefighter

Icon image SWAT

Icon image Search & Rescue

Search & Rescue

Icon image Solar Power

Icon image Geothermal, Biomass, and Hydrogen

Geothermal, Biomass, and Hydrogen

Icon image Solar Power

Icon image Black Death

Icon image Malaria

Icon image What Are Germs?

What Are Germs?

Icon image Smallpox

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