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There are no restrictions on out of print books within Safari Books Online. I just checked and this book is available. So you should be able to add to your bookshelf.
I am attaching a screenshot of http://my.safaribooksonline.com/15659... You can click on the "Add to my bookshelf" button on the right.
If you are not seeing this button, please contact firstname.lastname@example.org They can look up your account and offer additional guidance.