Due to copyright restrictions, only the content ids (or hashes/checksums) of associated publication PDFs are made available in this public registry.
An example of such content id can be found at Adb El-Halim et al., 2005.pdf.md5.
Records associated with this specific pdf can be found via Zenodo by searching for the hash (e.g., “639988a4074ded5208a575b760a5dc5e” or “hash://sha256/639988a4074ded5208a575b760a5dc5e”) using https://zenodo.org/search?q=639988a4074ded5208a575b760a5dc5e or https://zenodo.org/search?q=%22hash%3A%2F%2Fmd5%2F639988a4074ded5208a575b760a5dc5e%22 respectively.
Do note, however, that some PDFs are made available via the Zenodo TaxoDros Community at https://zenodo.org/communities/taxodros . In addition, the pdf corpus is published as a restricted access data publication at:
Bächli, G. (2024). Data Appendix to TaxoDros - The Database on Taxonomy of Drosophilidae hash://md5/26a67012dde325cf2a3a058cc2f9c1b8 hash://sha256/ca86d74b318a334bddbc7c6a387a09530a083b8617718f5369ad548744c602d3 [Data set]. Zenodo. https://doi.org/10.5281/zenodo.10962885
and is available upon request.