http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
v. 1. Science, technology, and medicine -- v. 2. Social sciences.
"This book is the first volume of a series that succeeds Walford's guide to reference material, published in eight editions between 1959 and 2000 by Library Association Publishing"--Title page verso.
"This book .... succeeds Walford's guide to reference material, published in eight editions between 1959 and 2000 by Library Association Publishing."