You mean by: Lucille Barco Coone
Did you try the publisher: Baltimore, Gateway Press?
I do see the note there, "book orders to: Lucille Barco Coone, 632 Southwest 27th Court, Gainesville, FL 32601"; but you didn't get any response from Leah Anne H.C. Kram the illustrator?
All that I know, is that if its out of print, you'll have to order a copy from the publisher -- in the hopes that they'll reprint it -- which they probably won't if it had a small printing.
The other options would be to go to Gainesville, FL and look around the used book stores there, etc.
You should probably be able to find a used copy or two still hanging around; or probably their local genealogical society would have a number of copies.