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Addie Arizona crater asked astronomers Barringer chondrules coesite collection of meteorites Colorado crater rim Dean Gillespie Denver drove dust earth Estherville explosion farm farmer feet field fireball fragments geologists geology half Harlow Shapley Haviland crater Highway 66 hole hundred hunting impact impactite important institutions interest in meteorites investigations iron meteorite Kansas knew land later lecture Lednicky light look magnetic mass material McPherson College metallic meteor meteorite craters meteorite falls Mexico miles mineral Moulton Museum of Natural never nickel-iron Nininger Collection object oxidized pallasite Paragould particles Pasamonte picked Plainview planet plowed pounds purchase reached recognized recovered reported rock sample scientific scientists seemed seen showed small meteorites soil space specimens square miles stone stony meteorite story Sudbury Basin surface tektites Texas thirty tion told town trip truck University visited weighing witnessed witnessed fall wrote