Some of the KAS image collection can be found on the Watercolour World database - https://www.watercolourworld.org/collection/kent-archaeological-society .
This project has created a free online database of documentary watercolours painted before 1900. You can explore these fascinating visual records on a world map, search for topics that are important to you, and compare watercolours from multiple collections in one place. They hope that this project will not simply preserve the watercolour record but revive it, sparking new conversations and revelations. By making history visible to more people, the project can deepen our understanding of the world.
Before the invention of the camera, people used watercolours to document the world. Over the centuries, painters – both professional and amateur – created hundreds of thousands of images recording life as they witnessed it. Every one of these paintings has a story to tell, but many are hidden away in archives, albums and store rooms, too fragile to display. The Watercolour World exists to bring them back into view.
They are a UK-based charity, but the project is global. They work with private and public collections from around the world to locate and publish their images, many of which have never been photographed before.