zb1a American Antiquarian Society (AAS) Historical Periodicals Collection, Series 1
zb1c American Antiquarian Society (AAS) Historical Periodicals Collection, Series 3
zebo Britannica Academic (formally Encyclopædia Britannica Online)
zbcc Computer Source
dlg1 Digital Library of Georgia
zbeb eBook Academic Collection (EBSCO)
ebcn Ebook Central (ProQuest)
zbpd Professional Development Collection (education)