http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
history of inflectional n in English verbs before 1500
Issued also in microfilm form as thesis, University of Michigan, under title: The history of inflectional n in English verbs.
University of California publications in English ; v. 7, no. 4