Probably true - it's the only copy of Pep 11 that I've personally ever seen.
You may be interested in this book, as well - I bought this in a Blue label non-descript slab and it was a pleasant surprise when I cracked it out to learn it is a Larson (some edge foxing, white pages, slight glue on spine, name is erased under "BLUE"):
Incredible! That cover is so kick ( I love the fact you have to look really closely to notice its a train cover. And the knife in the back....
Ok, ok, 'You da Man!!' x2
2 Very cool books right there!!