The books listed are in order of the series.   You will notice that some of them are listed more than once.   That is because there are a few different printings of the book.  If you have been looking  for   them, you can buy them from here. 

The books underlined are linked to Amazon.  Just click on the title and it will take you right to the correct book at Amazon.

Here is a completel listing in order :

1 A Spell for Chameleon Del Rey pb 77
2 The Source of Magic Del Rey pb 79
3 Castle Roogna Del Rey pb 79
4 Centaur Aisle Del Rey pb 82
5 Ogre, Ogre Del Rey pb 82
6 Night Mare Del Rey pb 83
7 Dragon on a Pedestal Del Rey 83 pb
8 Crewel Lye Del Rey 85 pb
9 Golem in the Gears Del Rey 86 pb
10 Vale of the Vole Avon pb 87, TOR 2000
11 Heaven Cent Avon pb 88, TOR 2000
12 Man from Mundania Avon pb 89, TOR 2000
13 Isle of View Morrow hc Avon 90
14 Question Quest Morrow Avon 91
15 The Color of Her Panties Avon 92
16 Demons Don't Dream Tor 93
17 Harpy Thyme Tor 94
18 Geis of the Gargoyle Tor 95
19 Roc and a Hard Place Tor 95
20 Yon Ill Wind Tor 96
21 Faun & Games Tor 97
22 Zombie Lover Tor 98
23 Xone of Contention Tor 99
24 The Dastard Tor 2000
25 Swell Foop Tor 2001
26 Up in a Heaval Tor 2002

If you click on the "Book Covers" button it will take you to a couple of   pages that have all the covers of the books .  Even if you don't want to buy them, you might just want to look at the covers.

Amazon really has reasonable prices.  Some one just told me they paid $35.00 for Zombie Lover.  Amazon has the Hard Cover price at less than $20.00 ! !