human 137 Humans 96 Letter 67 History 62 article 62 female 50 male 48 Literature: history & criticism 46 adult 45 Diaries, letters & journals 43 Literature & literary studies 39 European history 38 Diaries, letters and journals 34 controlled study 33 Literature: history and criticism 30 History of the Americas 27 Female 26 Male 23 Biography: general 22 nonhuman 22 Adult 21 General and world history 21 attention 21 Philosophy 20 Article 19 COVID-19 19 Political structure & processes 19 Social & cultural history 19 United States 19 Attention 18