Opfermann1: One-page description
Opfermann Books2J19thC: detailed list of nineteenth century books
Opfermann20th1: detailed list of twentieth century books
Opfermann20th2: detailed list of twentieth century books
OpfermannNEWSPAP: detailed list of newspapers, mostly single issues
OpfermannSERIALS: list of serials; some long runs, mostly short
OpfermannSerialsSHORTR: list of short-run serials