I love Wheater's pathology and histology books. I looked through them last fall when I was in histo cuz our professor took her slides directly out of the functional histology book and the patho section of the histo course from the book you mentioned.
I'd recommend them.
I'd also recommend running a search on google or yahoo because often times you'll come across many med school websites which will have various slides and quizzes etc.
Just go to google.com and click on the images tab and do a search. you can find pics of anything using that. make sure you go into preferences first and click on do not filter search to get better results.