A fascinating reference site for information on postcard publishers, articles of interest... and the Cabinet of Curiosities.
A well-established postcard hobbyist site, with loads of information, particularly on German publishers.
Gracie wants to share "the best vintage erotica collection on the web."
Here I'll post links to any sites that I think you might find useful. If you have any favourite sites you'd like to share, or if you'd like me to name-check your own site, just let Gracie know.