- Leaflet Map https://jackdougherty.github.io/andrella-map-only/
- Google Sheets template - https://docs.google.com/spreadsheets/d/1o4Xlj7B1AdCuy0ORl4WE2lb8PbjjoA9Czi3wHDTODlc/edit#gid=0
- See step-by-step tutorial in Hands-On Data Visualization https://HandsOnDataViz.org/leaflet-storymaps-with-google-sheets.html