الموضوعات: Environmental protection Juvenile literature. Ohio, Natural resources Juvenile literature. Protection Ohio, Ecology Study and teaching Activity programs Ohio., Science Study and teaching Activity programs Ohio., Environnement Ouvrages pour la jeunesse. Protection Ohio, Conservation des ressources naturelles Ouvrages pour la jeunesse. Ohio, Écologie Étude et enseignement Méthodes actives Ohio., Sciences Étude et enseignement Méthodes actives Ohio., Ecology Study and teaching Activity programs., Environmental protection., Natural resources Protection., Science Study and teaching Activity programs., Ohio.

مصطلحات الفهرس: water, gallons, pollution, aquifer, drinking, recycling, cup, 'Activity Book', Juvenile works.

URL: http://epa.ohio.gov/portals/47/facts/ActivityBook.pdf
https://ohiomemory.org/digital/collection/p267401ccp2/id/10651