- Death Valley
- Deborah
- Decalogue
- Decapolis
- Decatur, Ill.
- Decatur, Stephen
- Deccan, The
- December
- Decemvirs
- Deciduous Habit
- Declaration of Independence
- Decoration Day
- De Cosmos, Amor
- Deer
- Deerfield, Mass.
- Defiance, Ohio
- Definitive Nucleus
- Defoe, Daniel
- Dehiscence
- DeKalb, John, Baron
- De Koven, Henry L. Reginald
- Delacroix, Eugéne
- Delagoa Bay
- Deland, Margaret
- Delaroche, Hippolyte
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- Delaware Bay
- Delaware, Ohio
- Delaware River
- Delaware, State of
- Delaware, Thomas West, Lord
- Delawares
- Delcassé, Théophile
- Delhi
- De Long, George Washington
- Delos
- Delphi
- Delta
- Deluge
- De Mille, James
- Demosthenes
- Denarius
- Denis, Saint
- Denison, Tex.
- Denmark
- Dennison, William
- Density
- Denver
- De Pauw University
- De Quincey, Thomas
- Derby
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- Dermatogen
- Descartes, Rene
- Deschanel, Emile A.
- Desmids
- Des Moines
- De Soto, Fernando
- Detaille, Jean Baptiste Edouard
- Detroit
- Detroit River
- Deucalion
- Development of Animal Life
- Devonshire, Spencer Compton Cavendish, Eighth Duke of
- Dew
- De Wet, Christian
- Dewey, George
- De Witt, Jan
- Dextrin
- Dhawalaghiri
- Dial
- Diamond
- Diana
- Diana, Temple of
- Diatoms
- Diaz, Bartolomeu
- Diaz, Porfirio
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