Social life and customs 17 History 11 Detective and mystery stories 10 Fiction 10 Hardy Boys (Fictitious characters) 9 Women 9 Drew, Nancy (Fictitious character) 6 British 5 Missing persons 5 Social conditions 5 Young women 5 African Americans 4 Friendship 4 Man-woman relationships 4 Mystery and detective stories 4 Older men 4 Aboriginal Australians 3 Adventure and adventurers 3 Boys 3 Dalits 3 Death 3 East Indians 3 Ethnic relations 3 Fathers and daughters 3 Married people 3 Politics and government 3 Young men 3 Alcoholics 2 Americans 2 Apartment houses 2