- Debt, Action of
- Debt, Public
- Declaration of Independence, American
- Declaration of Independence, Mecklenburg
- Declaration of Indulgence
- Delaunay, Louis Arsène
- Delaunay, Jules Elie
- De Laune, Etienne
- Delavan
- Delavigne, Jean François Casimir
- Delaware (State)
- Delaware (river)
- Delaware (Ohio)
- Delaware (tribe)
- Delaware Bay
- Delaware College
- Delaware Water Gap
- De la Warr, Thomas West, Lord
- Delbœuf, Joseph Remi Léopold
- Delbrück, Berthold
- Delbrück, Hans
- Delbrück, Martin Friedrich Rudolf von
- Delbrück, Max Emil Julius
- Delsarte, François Alexandre Nicolas Chéri
- Democratic Party
- Dervish
- Denk, Hans
- Denman, Thomas
- Denmark
- Denner, Balthasar
- Dennery, Adolphe Philippe
- Denudation
- Denver
- Depping, Georg Bernard
- Des Moines
- Des Moines College
- Des Moines River
- Desmospongiæ
- Desor, Eduard
- Determinism
- Detinue
- Detmold
- Detritus
- De Trobriand, Philippe Regis
- Detroit
- Detroit (Minnesota)
- Detroit River
- Detroyat, Pierre Léonce
- Dettingen
- Deucalion
- Deucher, Adolf
- Deus ex Machina
- Deus-Ramos, João de
- Deussen, Paul
- Deus Vult
- Deuteronomy
- Deutsch, Emanuel Oscar
- Devil's Island
- Dexter, Henry Martin
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- Dickens, Charles
- Dickinson, Emily
- Dictionary
- Diderot, Denis
- Diet (meeting)
- Dieterici, Friedrich
- Dieterici, Karl Friedrich Wilhelm
- Dietrich, Auguste Edgard
- Dietrich, Christian Wilhelm Ernest
- Dietrich of Bern
- Dietrichson, Lorentz Henrik Segelcke
- Dietrich von Niem
- Dietsch, Heinrich Rudolf
- Dietz, Feodor
- Diniz da Cruz e Silva, Antonio
- Dinka
- Dinkard
- Dinmont, Dandie
- Dino Compagni
- Dinoceras
- Dinocrates
- Dinornis
- Dinosauria
- Dinotherium
- Dinter, Gustav Friedrich
- Dip
- Dīpavansa
- Distribution of Animals
- Distribution of Plants
- District
- District Attorney
- District Court
- District of Columbia
- Distringas
- Disturbance
- Disturbance of Public Worship
- Dixwell, John
- Dod, Daniel
- Dodd, Moses Woodruff
- Dog
- Dogbane
- Donaldson, Edward
- Donaldson, James
- Donaldson, James Lowry
- Donne, John
- Donnelly, Ignatius
- Donner, Johann Jakob Christian
- Donner, Raphael
- Donnithorne, Arthur
- Donnybrook
- Donoso, Justo
- Donoso-Cortés, Francisco Maria de la Salud
- Doré, Paul Gustave
- Doree
- Doremus, Robert Ogden
- Doremus, Sarah Platt
- Douglas, Stephen Arnold
- Dove-Plant
- Dover (Kent)
- Dover (Delaware)
- Dover (New Jersey)
- Dover (New Hampshire)
- Dover (Tennessee)
- Dover, Strait of
- Dover's Powder
- Dove-Tick
- D'Ovidio, Francesco
- Dow, Gerard
- Dow, Lorenzo
- Dow, Neal
- Dowager
- Dowitcher
- Dowlas
- Dowler, Bennet
- Dowling, John
- Down
- Downcast
- Downing, Andrew Jackson
- Downing, Charles
- Downing, George
- Downing College
- Downing Street
- Downpatrick
- Downs
- Downs, The
- Downy Mildew
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- Dracæna draco
- Drachenfels
- Drake, Francis
- Drake, Francis Samuel
- Drake, Friedrich Johann Heinrich
- Drake, Joseph Rodman
- Drake, Nathan
- Drake, Samuel Adams
- Drake, Samuel Gardner
- Dred Scott Case
- Drew Theological Seminary
- Drexel Institute of Art, Science, and Industry
- Dreyfus, Alfred
- Drosometer
- Drossinis, George
- Droste-Hülshoff, Annette Elizabeth
- Drown, Thomas Messinger
- Drupe
- Drupelet
- Drury, Dru
- Drury Lane
- Drury Lane Theatre
- Drury's Bluff, Battle of
- Druses
- Drusilla
- Drusius, Johannes
- Dubufe, Claude Marie
- Dubufe, Edouard
- Dubufe, Edouard Marie Guillaume
- Dubuque
- Duc, Joseph Louis
- Du Camp, Maxime
- Dueling
- Dulcinea del Toboso
- Dulcinists
- Dulk, Albert Frederick Benno
- Dülken
- Duller, Eduard
- Dulong, Pierre Louis
- Dulong and Petit, Law of
- Dulse
- Duluth
- Dulwich
- Dumaguete
- Dumangas
- Dumangate
- Dumanjug
- Dumas, Adolphe
- Dutch Language
- Dyer, John
- Dyer, Louis
- Dyer, Mary
- Dyer, Nehemiah Mayo
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- Eadmund
- Eads, James Buchanan
- Eagan, Charles Patrick
- Eagle
- Eagle (standard)
- Eagle, Black
- Eastern Question
- Eaton, John Henry
- Eaton, Margaret (O'Neill)
- Ebner-Eschenbach, Marie, Baroness von
- Ecology
- Eddy, Mary Baker Glover
- Edlund, Erik
- Eichberg, Julius
- Eichendorff, Joseph, Baron von
- Eichens, Friedrich Eduard
- Eichens, Philipp Hermann
- Eiselen, Ernst Wilhelm Bernhard
- Eisenach
- Elective Courses
- Electoral College
- Electoral Commission
- Electoral Reform
- Electoral Votes
- Electors, German Imperial
- Electra
- Elijah
- Elisha
- Elizabeth Islands
- Elizabeth Petrovna
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