In anticipation of moving to a smaller house in a few years, I'm
breaking up my lifelong book collection of about 5,000 paperbacks and
hardcovers and listing them at Amazon. Thanks to addall, alibris, abebooks
and Amazon itself, I've been able to get a good handle on each book's value
and offer it at a fair price.

One book, however, has baffled me -- a pulpish juvenile football novel
called "Hitting the Line" by Ralph Henry Barbour (Appleton, 1917), which I
picked up as a kid 35 years ago or so. It's far from top quality -- it's
been well read by several generations, and one or more previous owners wrote
or scribbled on the endpages.

While it would seem like throwaway junk, there's one key difference:
"Hitting the Line" was illustrated by a very young Norman Rockwell, who
contributed four color plates. The plates are all in excellence condition.

My problem is none of the above mentioned websites lists any copies of
"Hitting the Line." One seller mentions that Rockwell illustrated four of
Barbour's books, but I find only two titles listed ("The Secret Play" and
"The Purple Pennant") at prices ranging from $50 to $550. Various Google
searches proved fruitless, too.

Any tips on other sites to check would be much appreciated. Thanks in
advance.