20thcentury [e] action activities activitybooks adventure adventureandadventurers adventurers amphibians animalrescue animals asia autobiography automotive automotivetechnology beginner biography biologicalsciences boating boats boatsandboating boys brothersandsisters camping cats ced chameleons chapterbooks childrenandtheenvironment classics collegesuccess comingofage concepts consumerguides countrylife crafts craftsforchildren criminals ctr curiosities dance detectivestories discovery dolphins ecosystems education emotions encyclopedias engineering english environmentalconservation environmentalscience europe exercise exploration fantasy father-sonrelationship fathersandsons feelings fiction fitness forests friendship general generalinterests girls guineapigs hamsters health historical hobbies hom013000 howthingswork-aremade humorousstories imagination intermediate inventions juvenilefiction juvenilenon-fiction lakes littlecritter(fictionalcharacter) magic marine marineanimals marinelife mediatie-in men mice military minerals multigenerational mysteries mysteryanddetectivestories nature naval noah'sark noah(biblicalfigure) nutrition ocean oceans outdoor outdooractivities outdoorskills outlaws pictorial picturebooks pirates play polarregions protection railroads reader recreation recreationalareas reference reptiles rivers rocks runaways sailing school sciencefiction seafaringlife seas seastories self-esteem self-reliance shipbuilding ships siblings sounds sports storiesinrhyme survivalstories technology thenaturalworld tr trades trains transportation travel trees tugboats wars water(oceans watersports weather women wonders