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     <h2><a href="wkt-proj-4.html">CF Grid Mapping &rlhar; CRS WKT</a></h2>
 
     <h2>Conventions preceding CF 1.0</h2>
-    The development of the CF convention built upon three earlier netCDF conventions: <a href="https://ferret.pmel.noaa.gov/Ferret/documentation/coards-netcdf-conventions">COARDS</a>, NCAR CSM and <a href="GDT">GDT</a>, as well as the NetCDF User Guide. Development of CF began in 1999, and there were several <a href="CF-beta">beta versions of CF</a> before 1.0.
+    The development of the CF convention built upon three earlier netCDF conventions: <a href="https://ferret.pmel.noaa.gov/Ferret/documentation/coards-netcdf-conventions">COARDS</a>, NCAR-CSM (<a href="https://doi.org/10.5281/zenodo.14649053">doi:10.5281/zenodo.14649053</a> <a href="/Data/ncar-csm-conventions-1.0.pdf>PDF</a>) and GDT (<a href="https://doi.org/10.5281/zenodo.13314769">doi:10.5281/zenodo.13314769</a> <a href="GDT">PDF and HTML</a>), as well as the NetCDF User Guide. Development of CF began in 1999, and there were several <a href="CF-beta">beta versions of CF</a> before 1.0.
 
   </div>