Use the DNB (German National Library) to search for the specific title or document ID.
If you are looking for a specific technical standard or environmental guide, use these targeted search methods: Download ktst10Umweltund pdf
Check the Umweltbundesamt (German Environment Agency) or the BfR (Federal Institute for Risk Assessment) websites, as they host most German environmental and health PDFs. Use the DNB (German National Library) to search