What  major publications make available details on the completeness of their online backfiles?

I have used the excellent sources provided by JSTOR.  Do other publishers provide lists of missing issues?  I am currently reviewing titles for possible withdrawal of print and would find this information invaluable.

Diane

Diane Paldan

Serials/Preservation

Materials Processing & Preservation

Technical Services

135 Science and Engineering Library

Wayne State University

Detroit, MI  48202

(313) 577-0222