Classic module which truly explained, and demonstrated, the legendary Drow Elves. This module maps out a large Drow city, in the Underdark realm. It is classic, old-school, in every way. Much of the city is left blank, for description, to allow the DM to develop it as they see fit. Key encounter areas are detailed, of course. It is not a place for the blundering warrior to waltz through, smashing every evil creature he sees... That would be suicidal. It is quite daunting to look at the city map, and realize just how much of it is a blank canvas for the DM to paint in their vision of the city. While the DM could fill in all of the blank areas, it is also possible to just gloss over the blank areas of the city, and only play those areas detailed by Gygax.
With regards to quallity of the scan, it is quite readable. The maps are clear. It is fully complete. The price is a bargain compared to rare copies which occasionally appear on sites like e-Bay, Amazon, and other online vendors of OOP books, and gaming materials. If you want a copy, buy it now. There is no guarantee it will be around in the future. Cheers!