Fortress of Solitude appears in 106 issues in this volume.
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Issue #21
March 1943
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Issue #58
Introducing Tiny Trix The Little Big Shot of the Underworld
May 1949
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Issue #129
The Ghost Of Lois Lane / Clark Kent Fireman of Steel! / The Girl in Superman's Past!
May 1959
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Issue #132
Superman's Other Life!
October 1959
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Issue #138
Titano, The Super-Ape! / Superman's Black Magic! / The Mermaid From Atlantis!
July 1960
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Issue #139
The New Life of Super-Merman! / The Jolly Jailhouse! / The Untold Story of Red Kryptonite!
August 1960
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Issue #140
The Son of Bizarro!
October 1960
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Issue #142
Lois Lane's Secret Helper! / Superman Meets Al Capone! / The Flame Dragon from Krypton!
January 1961
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Issue #144
The Super-Weapon! / Superboy's First Public Appearance! / The Orphans of Space!
April 1961
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Issue #148
October 1961
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Issue #149
The Death of Superman!
November 1961
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Issue #151
The Three Tough Teen-Agers! / The Man Who Trained Superman! / Superman's Greatest Secret!
February 1962
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Issue #152
The Robot Master! / Superbaby Captures the Pumpkin Gang! / The TV Trap for Superman!
April 1962
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Issue #153
The Day Superman Broke the Law! / The Secret of the Superman Stamp! / The Town of Supermen!
May 1962
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Issue #154
The Underwater Pranks of Mr. Mxyzptlk! / Krypton's First Superman!
July 1962
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Issue #156
The Last Days of Superman!
October 1962
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Issue #157
The Super-Revenge of the Phantom Zone Prisoner! / The Super-Genie of Metropolis / Superman's Day of Doom!
November 1962
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Issue #162
The Amazing Story of Superman-Red and Superman-Blue!
July 1963
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Issue #163
Wonder-Man, the New Hero of Metropolis! / The Goofy Superman!
August 1963
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Issue #166
The Fantastic Story of Superman's Sons!
January 1964
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Issue #167
The Team of Luthor and Brainiac!
February 1964
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Issue #168
Luthor - - Super-Hero!
April 1964
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Issue #171
Superman’s Sacrifice! / The Curse Of Magic! / The Nightmare Ordeal of Superman!
August 1964
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Issue #172
The Tyrant Superman!
October 1964
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Issue #173
The Untouchable Clark Kent! / Tales of Green Kryptonite No. 1 / The Triumph of Luthor and Brainiac!
November 1964
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Issue #174
Clark Kent's Incredible Delusion! / Super-Mxyzptlk... Hero!
January 1965
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Issue #175
Clark Kent's Brother!
February 1965
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Issue #176
The Revenge of the Super-Pets! / Tales of Green Kryptonite No. 2 / Superman's Day of Truth!
April 1965
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Issue #177
Superman's Kryptonese Curse! / The Menace Called "It"! / When Jimmy Olsen Stole Krypto From Superman
May 1965
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Issue #179
The Outlaw Fort Knox! / The Menace Of Gold Kryptonite! / Private Kent, The Fighting Marine!
August 1965
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Issue #181
The Super-Scoops of Morna Vine! / The Superman of 2965!
November 1965
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Issue #182
The New Lives of Superman! / The Menace of the Terrible Toyman!
January 1966
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Issue #185
Superman's Achilles Heel! / Target Superman!
April 1966
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Issue #195
The Fury of the Kryptonian-Killer!
April 1967
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Issue #198
The Real Clark Kent! / The Fate of the Super-Super-Superman!
July 1967
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Issue #201
Clark Kent Abandons Superman!
November 1967
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Issue #203
Clark Kent's Biggest Day! / Superman's Black Magic! / When Superman Killed His Friends!
January 1968
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Issue #204
The Case of the Lethal Letters! / The Duplicate Superman! / The Fortress of Fear!
February 1968
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Issue #205
The Man Who Destroyed Krypton!
April 1968
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Issue #209
The Clark Kent Monster! / The Super-Servant of Crime
August 1968
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