Fortress of Solitude appears in 106 issues in this volume.
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Issue #215
Lois Lane... Dead... Yet Alive / Superman's First Exploit
April 1969
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Issue #218
Superman's Secret Past! / The World of Mr. Mxyzptlk!
July 1969
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Issue #223
Half a Hero!
January 1970
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Issue #225
The Secret of the Superman Impostor!
April 1970
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Issue #228
The Mystery Bombers! / Execution Planet!
July 1970
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Issue #231
The Wheel of Super-Fortune!
November 1970
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Issue #236
Planet of the Angels; The Doomsayer!
April 1971
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Issue #251
The Island that Invaded the Earth! / The Day Krypton didn't Die!
May 1972
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Issue #254
The Kid who stole Superman's Powers! / The Baby who walked through Walls!
July 1972
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Issue #258
Fury of the Energy Eater! / Who is Mr. X?
November 1972
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Issue #268
Wild Week-End in Washington! / A Tale of Time and Tide!
October 1973
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Issue #273
The Wizard with the Golden Eye! / Blind Date!
March 1974
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Issue #283
Superman's Mystery Masquerade! / One of Our Imps is Missing!
January 1975
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Issue #295
"Costume, Costume -- Who's Got the Costume?"
January 1976
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Issue #297
Clark Kent Forever - - Superman Never!
March 1976
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Issue #298
Clark Kent, Get Out of My Life!
April 1976
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Issue #299
The Double-or-Nothing Life of Superman!
May 1976
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Issue #306
Backward Battle for the Bizarro World!
December 1976
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Issue #307
Krypton -- No More!
January 1977
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Issue #308
This Planet is Mine!
February 1977
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Issue #315
Good Evening, Superman I'm Clark Kent... and You're not!
September 1977
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Issue #321
Too Strong to Survive!
March 1978
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Issue #322
Laser War over Metropolis!
April 1978
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Issue #325
The Super Sellout of Metropolis!
July 1978
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Issue #327
The Sandstorm That Swallowed Metropolis!; Two Can Die As Cheaply As One
August 1978
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Issue #328
The Attack of the Kryptonoid!; Clark Kent, How would You like to Meet your Real Father?
October 1978
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Issue #335
Mxyzptlk spelled backward is T-R-O-U-B-L-E
May 1979
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Issue #337
Too Many Crooks!
July 1979
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Issue #338
Let My People Grow!
August 1979
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Issue #351
The Fiend with Nine Faces!; Mister Mxyzptlk’s Circus Caper!
September 1980
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Issue #352
Day of Destiny!; The Mark of a Citizen!
October 1980
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Issue #358
Father Nature's Folly!; A Day in the Life of Bruce (Superman) Wayne
April 1981
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Issue #360
Is Superman Going...Going...Gone?; Day into Night--Night into Day!
June 1981
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Issue #362
The Last Days of Lois and Lana!: Metropolis: Day 1
August 1981
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Issue #363
The Dying Day of Lois and Lana!: A Night in the Life of Bruce (Superman) Wayne!
September 1981
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Issue #364
The Sounds that Menaced Metropolis!: Sun-Death!
October 1981
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Issue #365
When Kryptonians Clash!; Where, Oh Where has Superboy Gone?
November 1981
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Issue #366
Revenge, Superman-Style; Perry White's Superboy Scoop!
December 1981
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Issue #367
The Revengers Strike Back!; ...And not a Drop to Drink
January 1982
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Issue #368
The Revenger of Steel!; Deadly New Year--2021!
February 1982
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