The original version of what became S4: The Lost Caverns of Tsojcanth (note the different spelling of the last word). Originally written for WinterCon V by Gary Gygax.
It is estimated the print run of the module is only 300.
Counting the pages is difficult. Most accounts of this module list "8 loose leaf pages".
Well, there is the cover itself that's 11 by 17 inches, there are 4 8.5 by 11 inch sheets with typing front and back. One 8.5 by 11 sheet with 4 illustrations, each occupying a 5.5 by 8 inch space, and 6 5.5 by 8 inch single sided character sheets.
The character sheets were printed two to a page and then cut in half when used.
This is the only module by Gary Gygax that was published separately for the original version of Dungeons & Dragons.