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- Reconstruction Era
- Recovery
- Redemption
- Redemption Story
- Reference
- Reflective
- Reflective Fiction
- Reflective Writing
- Reformist Literature
- Refugee
- Refugee Experience
- Regency
- Regency Era
- Regional
- Regional Fiction
- Regional History
- Regional Studies
- Regionalism
- Relationship
- Relationship Drama
- Relationship Fiction
- Relationships
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- Religious Conflict
- Religious Fiction
- Religious Literature
- Religious Satire
- Religious Studies
- Religious Thriller
- Remote Work
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- Renaissance Literature
- Renewable Energy
- Research
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- Resistance Literature
- Retail Industry
- Retelling
- Retellings
- Retirement Planning
- Revenge
- Revenge tragedy
- Revolution
- Revolutionary History
- Revolutionary Literature
- Revolutionary War
- Revolutionary War History
- Rhyming
- Risk Management
- River Literature
- Road Novel
- Road Trip
- Robinsonade
- Robotics
- Rock 'n' Roll Fiction
- Rock Music
- Roman Literature
- Roman Mythology
- Romance
- Romance Drama
- Romantic Adventure
- Romantic Comedy
- Romantic Comedy Drama
- Romantic Drama
- Romantic Escapism
- Romantic Fantasy
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- Romantic Suspense
- Romantic Thriller
- Romantic Tragedy
- Romanticism
- Rowing
- Royalty
- Running
- Rural
- Rural Fiction
- Rural Life
- Russian History
- Russian literature
- Safety
- Saga
- Sales
- Satire
- Satirical fiction
- Savings
- Scandal
- Scandinavian
- Scandinavian Crime
- Scandinavian Fiction
- Scandinavian Literature
- Scandinavian Noir
- Scholarly
- School
- School Life
- School Stories
- School Story
- Science
- Science Advocacy
- Science and Nature
- Science and Society
- Science Communication
- Science Education
- Science Essays
- Science Fantasy
- Science Fiction
- Science History
- Science Philosophy
- Science Popularization
- Science Writing
- Scientific Biography
- Scientific Essays
- Scientific Exploration
- Scientific History
- Scientific Inquiry
- Scientific Literature
- Scientific Research
- Scientific Writing
- Scottish Fiction
- Scottish History
- Scottish Literature
- Sea Stories
- Sea Story
- Seafaring
- Seasonal
- Seasonal Fiction
- Second Chance Romance
- Second Chances
- Secret Societies
- Secrets
- Secularism
- Self-discovery
- Self-help
- Self-improvement
- Self-reference
- Self-reflection
- Semi-Autobiographical
- Sensation novel
- Sentimental Fiction
- Sentimental Novel
- Sentimentalism
- Sequel
- Serial
- Serial Killer
- Serial Killer Fiction
- Serial Killers
- Serialized Novel
- Series
- Series fiction
- Sermons
- Settlement History
- Short Stories
- Short Story
- Showbiz
- Sibling Relationships
- Sibling Rivalry
- Silicon Valley
- Simplicity
- Single Life
- Single Motherhood
- Skepticism
- Skill Acquisition
- Skill Development
- Skills Development
- Slavery
- Sleep
- Slice of life
- Small Town
- Small Town Fiction
- Small Town Life
- Social Change
- Social Commentary
- Social Contract Theory
- Social criticism
- Social Critique
- Social Dynamics
- Social History
- Social Issues
- Social Justice
- Social Media
- Social Media Strategy
- Social Philosophy
- Social Psychology
- Social Science
- Social Science Fiction
- Social Skills
- Socialism
- Sociobiology
- Sociology
- Socratic Dialogue
- Soft Science Fiction
- Software Development
- South America
- South American History
- Southern Fiction
- Southern Gothic
- Southern Literature
- Soviet Literature
- Space
- Space Exploration
- Space Opera
- Space Science
- Spanish Civil War
- Spanish Literature
- Special Education
- Special Needs
- Speculative
- Speculative Fiction
- Speculative Non-fiction
- Spiritual Fiction
- Spiritual Warfare
- Spirituality
- Sports
- Sports Fiction
- Sports History
- Sports Psychology
- Spy Fiction
- Stand-up Comedy
- Star Wars
- Startups
- Statecraft
- Statistics
- Steampunk
- Steamy Romance
- STEM Romance
- Stock Market
- Stoicism
- Storytelling
- Strategy
- Stream of Consciousness
- Stress Management
- Study Guide
- Style Guide
- Subculture
- Suburban Life
- Success
- Summer Novel
- Summer Read
- Superhero
- Superhero Fiction
- Supernatural
- Supernatural fiction
- Surgery
- Surrealism
- Survival
- Survival Fiction
- Survival Literature
- Suspense
- Suspense Thriller
- Sustainability
- Sustainable living
- Swashbuckler
- Swiss literature
- Sword and Sorcery
- Symbolism
- Systems Theory
- Tactical
- Tactical Studies
- Tactical Thinking
- Talent Development
- Team Building
- Teamwork
- Tearjerker
- Technical Writing
- Techno-thriller
- Technological
- Technological Fiction
- Technological Thriller
- Technology
- Technothriller
- Teen
- Teen Development
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- Television
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- Theological Fiction
- Theological literature
- Theology
- Theoretical Biology
- Theoretical Philosophy
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- Thermodynamics
- Thought-Provoking
- Thriller
- Time
- Time Management
- Time Travel
- Time-slip
- Totalitarianism
- Traditional
- Traditional Mystery
- Tragedy
- Tragic Fiction
- Tragic Romance
- Tragicomedy
- Train Journey
- Train Travel
- Training
- Transcendental Philosophy
- Transformational
- Transgressive Fiction
- Transportation
- Trauma
- Travel
- Travel Fiction
- Travel Literature
- Travelogue
- Treasure Hunt
- Tribal
- True Crime
- True Story
- Trust-building
- Turn-of-the-century literature
- Twentieth Century
- Twentieth Century Historical Fiction
- Twisted Narratives
- U.S. History
- U.S. Politics
- U.S. Presidents
- Uncertainty
- Underwater Exploration
- Unfinished
- Universe
- Uplifting
- Uplifting Fiction
- Urban
- Urban Fantasy
- Urban Fiction
- Urban Life
- Urban Planning
- Urban Setting
- Urban Studies
- Usability
- User Experience
- User Interface Design
- Utilitarianism
- Utopian
- Utopian and Dystopian Fiction
- Utopian Fiction
- Utopian Literature
- Vacation
- Value Investing
- Vampire
- Vampire Fiction
- Vampires
- Veganism
- Venture Capital
- Victorian
- Victorian Fiction
- Victorian Literature
- Vietnam War
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- Vietnamese Literature
- Violence
- Virtual Reality
- Virtue Ethics
- Visionary
- Visionary Fiction
- Visionary Literature
- Visual Arts
- Vulnerability
- Wall Street
- War
- War & Military
- War & Politics
- War and Conflict
- War and Conflict Fiction
- War Fiction
- War History
- War Literature
- War Memoir
- War on Terror
- War Stories
- War Strategy
- War Studies
- Warfare
- Wealth
- Wealth and Society
- Wealth Building
- Wealth Creation
- Wealth Inequality
- Wealth Management
- Weather
- Web Design
- Wedding Romance
- Weddings
- Weight Loss
- Well-being
- Wellness
- Werewolves
- Western
- Western Canon
- Western Fantasy
- Western Fiction
- Whimsical
- Whodunit
- Wild West
- Wilderness
- Wisdom
- Wisdom Literature
- Wit
- Witchcraft
- Witches
- Women in Business
- Women in Comedy
- Women in Music
- Women Sleuths
- Women's Fiction
- Women's Issues
- Women's Literature
- Women's Studies
- Work Culture
- Work-life Balance
- Working Class
- Working Class Struggles
- Working-Class Fiction
- Working-Class Literature
- Workplace
- Workplace Culture
- Workplace Dynamics
- Workplace Fiction
- Workplace Romance
- World History
- World War I
- World War I Fiction
- World War II
- World War II Fiction
- World-building
- Worldbuilding
- Writing
- Young Adult
- Young adult fiction
- Young Adult Mystery
- Young readers
- Youth
- Zen
- Zombie