One search result leads to a dead link: https://zenodo.org/record/4817498/files/7%20KARLEY.pdf . This file, possibly titled "7 KARLEY.pdf," is now defunct but was captured by the Wayback Machine, an internet archive. This is a strong clue that a PDF file directly related to "Karl Valerie" once existed, and the Wayback Machine might be your best bet to retrieve it. You can use the Wayback Machine website to input the original URL and see if a copy has been archived.
PDFs ensure that original page numbers, footnotes, margins, and official stamps remain exactly as they were in the physical archive. This is crucial for accurate academic citation.
If you are looking for specific authors named Karl or Valerie in related fields: Karl Popper's Evolutionary Philosophy