https://castcornwall.art/2023/10/25/new-publication-the-building-stones-of-helston/
Jan 4, 2024 - This illustrated booklet offers a guided walk around the historic town centre of Helston, looking back into the deep geological past of the building stones...
new publicationbuilding stoneshelstoncastcornwall
https://simonwillison.net/2010/Apr/11/concordance/
Yahoo! GeoPlanet is now mapped to identifiers from other gazetteers such as GeoNames, FIPS and IATA - and those identifiers are available via the GeoPlanet API.
building blocksrosettastonesgeographicidentifiers