It seems like some manufacturers only do a "run" of fabric, and then when it's gone, it seems to be gone. It's never (hardly ever) seen again.
So a lot of times if one sees a design in a book, the fabrics are long gone.
Then one may be able to buy similar ones, but I would not bet my life on trying to find the exact same ones.
New designs, prints, and colors are always coming out - but sometimes it's (nearly) impossible to find a certain print after it's been sold out.