For Europe, there are academic and public organizations that publish these ENF backlog since about 2017. For US, I couldn't find any open dataset. For these re

For Europe, there are academic and public organizations that publish these ENF backlog since about 2017. For US, I couldn't find any open dataset. For these regions, I'm basically recording the sound of an A/C motor to get the reference data, but I only have a few months of backlog. See here for the coverage of the webapp: https://datethis.app/coverage https://datethis.app/coverage