Dungeon Geomorphs Set One:  Basic Dungeon by Gary Gygax
Dungeon Geomorphs Set Two:  Caves & Caverns by Gary and Ernie Gygax
Dungeon Geomorphs Set Three:  Lower Dungeons by Gary Gygax
Dungeon Geomorphs Sets One-Three by Gary Gygax

The first three individual sets were later combined into the compilation Dungeon Geomorphs Sets One-Three.  They were followed up by the Outdoor Geomorphs.

Interestingly, the individual sets featured sample dungeon sections that were not included in the later compilation.  As contributor Paul Stormberg notes, "These are classic Gygax ones: secret temples, lost demon gods, weird magic items, never again reproduced monsters, NPC's, etc.  In my opinion, one of the great unnoticed treasures of Greyhawk knowledge!"  Gary Gygax has since clarified that this information did not come from his Castle Greyhawk dungeon, but was rather created specifically for the Dungeon Geomorphs.  Thanks to Bill Silvey for this info.
 

Printing Information

Dungeon Geomorphs Set One

• First (1976):  Lizard logo.  TSR Stock # on bottom left is "F1002".  This printing was included in early D&D Basic Sets, but was NOT shrinkwrapped (making the separately-sold, shrinkwrapped copies much rarer).
   
• Second:  Lizard logo.  TSR Stock # on bottom left is "9004".
   
• Third (1978?):  As Second, but Wizard logo.

Dungeon Geomorphs Set Two

• First (1977):  Lizard logo.  TSR Stock # on bottom left is "F1003".
   
• Second:  Lizard logo.  TSR Stock # on bottom left is "9005".
   
• Third (1978?):  As Second, but Wizard logo.

Dungeon Geomorphs Set Three

• First (1977):  Lizard logo.  TSR Stock # on bottom left is "F1004".  
   
• Second:  Lizard logo.  TSR Stock # on bottom left is "9006".
   
• Third (1978?):  As Second, but Wizard logo.

Dungeon Geomorphs Sets One-Three

• First (1980):  Wizard logo.  "Dungeons & Dragons" title is centered, top of the front cover.
   
• Second (1981):  TSR Face logo.  "Dungeons & Dragons" title removed; "For D&D Fantasy Adventure Game" is in a red, angled banner to top left.  ISBN (0-935696-37-7) on back, lower left corner.  (Thanks to Rene Hurka for this info, and the scan).
   
• Third:  TSR Face logo.  "Dungeons & Dragons" title removed; "For D&D Fantasy Adventure Game" is in a red, angled banner to top left.  Product Code (394-51646-XTSR0600) stacked above ISBN (0-935696-37-7) on back, lower left corner.  (Thanks to Rene Hurka for this info, and the scan).

The individual sets are fairly rare, while the compilation set is uncommon at best.

• Dungeon Geomorphs Set One:  1st prt NM: $43 (3/03), 3rd prt VF: $22 (6/00)

• Dungeon Geomorphs Set Two:  1st prt NM: $58 (3/03), 2nd prt NM/SW: $99 (11/99), 2nd prt
    VF/SW: $76 (11/99), 3rd prt VF: $22 (6/00), 3rd prt NM/SW: $52 (12/04)

• Dungeon Geomorphs Set Three:  1st prt NM: $64 (3/03), 1st prt NM/SW: $90 (11/99),
    3rd prt NM/SW: $51 (12/04)

Dungeon Geo Set 3 (1st)

Dungeon Geo Set 3 (3rd)

Dung Geo Sets 1-3 (1st)

Dung Geo Sets 1-3
(2nd-3rd prt)