["BIOGRAPHY & AUTOBIOGRAPHY \/ Historical","BIOGRAPHY & AUTOBIOGRAPHY \/ Political","Biography & Autobiography \/ General","Biography & Autobiography \/ Science & Technology","Historical - U.S.","Political","Scientists - Astronauts","Scientists - General","Astronauts - United States","Glenn, John","Legislators - United States","USA","Biography \/ Autobiography","Astronauts;United States;Biography.","BIOGRAPHY & AUTOBIOGRAPHY \/ Political","BIOGRAPHY & AUTOBIOGRAPHY \/ Science & Technology","Biography","Biography & Autobiography \/ General","Biography\/Autobiography","GENERAL","General Adult","Legislators;Biography.","Legislators;United States;Biography.","MANNED SPACE EXPLORATION","Non-Fiction","U.S. SENATE","United States","1921-","Astronauts","Biography","Glenn, John,","Legislators","United States","Manned Space Exploration","U.S. Senate","Biography: Science, Technology & Medical","Biography\/Autobiography","Biography & Autobiography","Biography: general","Biography: political","Central government","History of science","Political leaders & leadership","Popular astronomy & space","Space science","Space travel & exploration"]