https://cartography-playground.gitlab.io/playgrounds/data-classification-methods/
https://transparentgov.net/json2tree/arcgis/featurelayer/quantity_data.html?backgroundlayerurl=https%3A%2F%2Fservices.arcgis.com%2FV6ZHFr6zdgNZuVG0%2FArcGIS%2Frest%2Fservices%2Fcounties_politics_poverty%2FFeatureServer%2F0&layer=counties_politics_poverty&dynamicLabelField=nolabel&_center_lat=34.524278772505866&_center_long=-85.90936147009981&_center_zoom=5&panto=0&colorScale=colorScale_gray&symbolType=quantity&quantityFieldName=POP_POVERTY
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fservices.arcgis.com%2FV6ZHFr6zdgNZuVG0%2FArcGIS%2Frest%2Fservices&url=https%3A%2F%2Fservices.arcgis.com%2FV6ZHFr6zdgNZuVG0%2FArcGIS%2Frest%2Fservices&select_folder=1940&select_layer=0