WGS1 Five Shall Be One by Carl Sargent
WGS2 Howl From the North by Dale "Slade" Henson

Both modules are for mid-level characters, and deal with the recovery of magical swords (perhaps the reason for the "WGS" designation?).  They were intended to form a trilogy; the third part of the series is the Greyhawk Wars boxed set (thanks to Adrian Newman for this info).
 

Printing Information

There were but single printings of each of these modules.

Thanks to Adrian Newman for the scans. 
 

Compared to its prequel, WGS2 seems to attract little attention, fetching only slightly more than cover price.

• WGS1 Five Shall Be One:  FN: $34 (5/00), FN: $31 (7/00)
• WGS2 Howl From the North:  FN: $21 (5/00), NM/SW: $14 (7/00), NM/SW: $16 (7/00)

Howl From the North