1991 20thcentury 320 adventureandadventurers adventurestories adverseeffects analysis ancientcivilization archaeologicalexpeditions archaeology children'sfiction children:grades4-6 congenitalabnormalities congresses diseases environmentalexposure ethnicrelations etiology fiction governmentregulation governmentrelations granite hardyboys(fictitiouscharacters) hazardouswaste healthandhygiene healthaspects history indians industria isotopes isotopeseparation jurisprudence juvenilefiction legislation medicalcare mining mysteryanddetectivestories navajoindians northamerican nuclearfuels nuclearweapons persiangulfsyndrome persiangulfwar plot-your-ownstories plutonium politicalaspects radiation radiationinjuries radioactive radiobiology reactorfuelreprocessing securitymeasures socialaspects soilpollutants soldiers thorium uncles uranio uraniumenrichment uraniumindustry uraniumminesandmining veterans wa400 weapons