– further library catalogues and holding records –

Books and periodical holdings of 400 libraries out of eight federal states:

GVK
Union Catalogue
Access to E-Journals:
EZB
Database of E-Journals
 

The periodical holdings of Hamburg’s medical libraries:

GZM
  The periodicals’ and series’ union list of Hamburg’s medical libraries

Periodical holdings of roughly 4.300 libraries nationwide:

ZDB
  Serials database
The German central library’s search portal for medicine in Cologne:
MedPilot
  Virtual specialised library for medicine
 
A Service of the National Library of Medicine and the National Institutes of Health:
PubMed