Which Harper Lee novel was not published in the 20th century?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q28389', 'id': 0, 'label': 'screenwriter'}, {'type': 'INTERNAL', 'name_': 'Q495420', 'id': 1, 'label': 'David Baldacci'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q182658', 'id': 2, 'label': 'Harper Lee'}], 'links': [{'name_': 'P106', 'source': 1, 'target': 0, 'label': 'occupation'}, {'name_': 'P737', 'source': 1, 'target': 2, 'label': 'influenced by'}]}