1864?-1943 africa africanamericanagriculturists africanamericanfamilies africanamericanscientists agriculture agriculturists american autobiography biography botanists carver cats children children'sstories congresses dogs etiology foodallergy foodallergyinchildren gardening general georgewashington history historytuskegeeinstitute infatuation inventions juvenilenonfiction research salmonellafoodpoisoning snoopy(fictitiouscharacter) southern southernstates technology tuskegeeinstitute unitedstates