Vault of the Drow (1978) - First Printing

From the web:

The third and final module in the original "Drow" series by Gary Gygax.

In Vault of the Drow, the PCs reach the Drow city where the giant raids were instigated. But who instigated the instigators? 32-page booklet and cover with fold-out map.

This printing is identified by the pastel purple color, the wizard logo centered on the bottom of the cover, and no ISBN number on the cover.