Hi
I tried to contact his children with both e-mails I have. So far there has been no response.
I do know that there should be at least another 2 to 4 entries that he was working on.
All his work was done with WordPress and a bunch of WordPress plugins. As far as permissions, I am not sure what permissions would be needed. Other than JKBlue and Antonio Ra, most references that I know of were from public domain documents. He did list the resources he used (see resources on SWH).
In my opinion, his work is similar to a "school paper". You do a lot of research and list the sources used. One usually does not need permission(s) to use any resource information. Gerben's work is similar. As far as I know there is no plagerism. Just a thought.
For Gerben it was a "labor of love". Sadly, it is also an unfinished work. European countries, and possibly some Asian countries, will not be included.
He did have 2 sites. One was a "working/staging" site where the documents were written and edited; it probably contained some references also. The second site is the "published" site. How many documents and references were on his lap-top I do not know. If the work is transferred to another site it would be fantastic. It would be a shame to lose that work.
If transferred, and if someone decided to write the remaining countries, I will gladly help out as a proof reader/editor as I am very familiar with Gerben's writing style. Personally, I cannot write squat except technical documentation (typical engineer), but I do know English grammer - Maine schools stressed grammer not writing

. In addition I have all the WORD macros to assist in editing.
Jerry B