Domains where PDFs are available but not always found by Kopernio
Known
NOAA.gov. This domain has many prefixes such as st.nmfs.noaa.gov - It's important because they also have an extensive institutional repository of federal documents and publications (repository.noaa.gov).
Researchgate.net - This one isn't being found: https://www.researchgate.net/profile/Cindy_Tribuzio/publication/34976350_An_investigation_of_the_reproductive_physiology_of_two_North_Pacific_shark_species_spiny_dogfish_Squalus_acanthias_and_salmon_shark_Lamna_ditropis/links/0f317534eb68e334ee000000.pdf
asm.org
The same problem
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