A001. An Introduction to Sherlock Holmes
A002. Country squires and landowners
​​A003. Doctors and physicians
A004. Transportation modes 
A005. History of Scotland Yard
A​006. Thames River and pollution
​A007. Bee-keeping
​A008. Westminster Palace and Parliament
​A009. Christmas celebrations
A010. Legal practice
A011. 2nd Afghan war, from 1878-1880
A012. Gentleman clubs, such as the Diogenes Club
A013. History and usage of tobacco
A​014. Lodgings of Holmes and Watson
A015. ​Methods of Sherlock Holmes
​​A016. Canines (dogs) in the stories
A017. Poisons for murder
​​A018. Fingerprints in criminal investigations
​​​​A019. Phrenology and the study of skulls
A020. Postal service
​A021. Money (particularly the coins)
A022. British Museum
​A023. Use of chloroform
A024. Horse racing
A025. Marriage and wedding ceremonies
A026. Boxing
​A027. Temperance movement and alcohol
A028. Sport of fencing
A029. History, making, and use of paper
A030. Sherlock Holmes' family heritage
A031. Inheritances and succession
A032. Firearms
​A033. Handcuffs
A034. Canning and food preservation
​​A035. Opium​
A036. Air pollution in London
​​A037. "Brain-fever" and associated illnesses
​A038. Covent Garden and opera
A039. Bathing and cleanliness
A040. Circus and performances
A041. Women's fashions
​A042. Port of Dundee in Scotland 
A043. Poverty and low-income living
A044. Vampires and sensational stories
A045. Snakes 
A046. Bicycles
A047. The Clergy
A048. Alcohol, pubs, and inns
A049. Magnifying lens and microscopes
A050. Governesses
​A051. Codes and ciphers
A052. Public schools
​A053. Sherlock Holmes' time at University
A054. Disguises used by Sherlock Holmes
​A055. Typesetting and typewriters
​A056. Warm drinks (coffee and tea)
​A057. Music
A058. Gas lamps and lighting
A059. "Brain Attic" and memory
A060. Personal columns in newspapers
A061. Traving in England with a Bradshaw
A062. Agra India and The Sign of Four
A063. Cardboard boxes
A064. Holmes' Music and the Gramophone
A065. The Lion's Mane and jellyfish
A066. Telephones 
A067. The Sport of rugby
A068. Brandy as a medicine
A069. The Crown Jewels
A070. Yellow fever
A071. The Italian Carbonari
A072. British banking
A073. Diabetes
A074. Pocket watches
A075. The coroner system
A076. Victorian fashion
A077. Visiting / greeting cards
A078. The Pinkerton Agency
A079. Tattoos
A080. Gossip / rumours
A081. Pawnbrokers
A082. The collecting hobby
A083. Identifying ears
A084. London stock market  
A085. Yellow paper backs
A086. Handkerchiefs
A087. Impressions for law enforcement
A088. Holmes vs. Dupin
A089. Gas lamps and heating
A090. Attempts of Victoria's life
A091. Voodooism
A092. Curare as a poison
A093. Addictions
A094. English life
A095. Life in London
A096. Society
A097. Houses
A098. Clothing
A099. Inventions
A100. Railways
A101. Children
A102. Games and toys
A103. Dresses and undergarments
A104. Schools
A105. Christmas traditions
A106. Victorian era
A107. Farm life
A108. House decorations
A109. Poverty
A110. Fashion accessories
A111. Men's fashions
A112. Fireplaces
A113. Christmas cards
A114. Bathrooms
A115. Toys
A116. Costumes
A117. Names
A118. Famous women
A119. Gardens
A120. Victorian laws
A121. Freemasons
A122. Tweed clothing
A123. Game of whist
A124. Leprosy disease
A125. Homelessness
A126. Chemistry
A127. Underground railway
A128. Hats
A129. Mathematics
A130. Astronomy
A131. Plumbing
A132. KKK in England
A133. Costume makeup
A134. Whaling
A135. Life Insurance
A136. Bohemian lifestyle
A137. Criminal insanity
A138. Public schools
A139. Scotland Yard
A140. Ciphers and Codes
A141. Disguises
A142. Bee-keeping
A143. 221B Baker Street
A144. Fingerprints
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