Little Masterpieces of ScienceEXPLORERSReading editionChapter navigation11 reading sectionsGo to chapterChoose a chapter…LITTLE MASTERPIECES OF SCIENCEEXPLORERSPREFACECONTENTSEXPLORERSCOLUMBUS DISCOVERS AMERICALEWIS AND CLARKE REACH THE PACIFIC OCEANTHE SOURCES OF THE MISSISSIPPIMANILA IN 1842THE ASCENT OF MOUNT TYNDALL.THE GRAND CAÑON OF THE COLORADOPrevious chapter ←CONTENTSNext chapter →COLUMBUS DISCOVERS AMERICAAll chapters and sections (11)LITTLE MASTERPIECES OF SCIENCEEXPLORERSPREFACECONTENTSEXPLORERSCOLUMBUS DISCOVERS AMERICALEWIS AND CLARKE REACH THE PACIFIC OCEANTHE SOURCES OF THE MISSISSIPPIMANILA IN 1842THE ASCENT OF MOUNT TYNDALL.THE GRAND CAÑON OF THE COLORADOTop◇← CONTENTSCOLUMBUS DISCOVERS AMERICA →