List of hp48-49-50 books/manuals/guides

[Giancarlo]

Hello,
I have a question For Paul Courbis or others that may know the answer.
I bought twice the book ‘hp48 programming utilities’ written by Ray depew and twice I received the book ‘an easy course in financial Calculation’ by Chris Coffin edited by Grapevine publications.

If you look on amazon for the first book, the picture visible will be of the second one. I think that there was a mismatch at the isbn code but I have no proof of that.

This is not an Amazon issue because the second time I bought it through TOS...

Since this book seems to be written also by Paul Courbis I was wondering if he knows the reason that that issue.

In breaF, I never saw the “hp48 programming utilities“ book in my life...


Thank to anyone can understand this issue.

Giancarlo