I used to have the 544 bug and for several years gathered many things for the two of them I owned.  I still have this collection of magazines (see listing below) but the best one is the center one that features the entire line up and history, along with tech specs and servicing data.  These have been stored in my closet since I bought them, non smoking and air conditioned, so they are in great condition.  I don't want to split them so one price for all and free shipping.  One of the greatest cars at the time that I ever owned.

Sept/Oct '86
May/June '87
May/June '88
Mar/April '90
Sept/Oct '91
Jan/Feb '92
July/Aug '92
Sept/Oct /93
Nov/Dec '94 
Motorbooks International - 100 pages of the story of the great 444/544 family