Our titles all have 4 ISBNs (digital, hardcover, softcover, softcover-US).
European librarians can order our hardcover titles from firstname.lastname@example.org. For availability in other countries, please get in touch with BOD
US Librarians can use the softcover-US ISBN for Baker & Taylor, or the other ISBNs for other retailers.
German librarians wondering how to order softcover copies via VLB, please read this blogpost.
We are happy to add more detailed information about your region of the world if you let us know which information you require.
Our OAI page is http://langsci-press.org/oai.