Hey Jac! Received your mail today. Thanks so much! I'll blog about it sometime down the road. I really like the scanned postmarks from your collection. I find the whole idea of the dpo very interesting. I'll have to read up on discontinued post offices.
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The money will be used to keep the IUOMA-platform alive. Current donations keep platform online till 1-nov-2020. If you want to donate to get IUOMA-publications into archives and museums please mention this with your donation. It will then be used to send some hardcopy books into museums and archives. You can order books yourself too at the IUOMA-Bookshop. That will sponsor the IUOMA as well.