If you can't find a book, go to Google Images (or AOL or whatever) and type what you may be looking for, then save the image to your computer hard drive by right clicking and clicking on save as....(apologies to you if this is very elementary)
Also, go to Google UK and type in various fabric names, such a tweed, and you will find merchants providing swatch photos. In the UK you may want to use the terms dogtooth, glen check/glen cheque, etc.
The estate tweed book may have possibly been the one published by Johnstons of Elgin, not too inexpensive as I recall.
Any US Scottish outfitter will have tartan photo books.
Your local library.
Not at hand, the book "Gentleman" by whatshisname from Germany has some fabric examples, one thinks.
Research Mr. Will's blog for examples to save.
A variety of county cloths at
www.tweed-jacket.com
If you're in the states, copying estate checques should not be a problem. Most of us don't have a clue. Now, if you go stalking the highlands that's another matter.
To get you started with makers and merchants (there are some that don't begin with H):
www.hlesser.co.uk
www.harrisonscloth.com
www.hfw-huddersfield.co.uk
www.hollandandsherry.co.uk
www.hainsworth.co.uk
(I think they're all still in business. Some I haven't checked in a couple of years.)