Historical Sites, Palm Springs, CA
model e1999, use feature service api, allow you view multiple layers combined.
https://transparentgov.net/json2tree/arcgis/js4/featurelayer_tree_multi.html?layer_id=3&layer=Historical+Sites+Area&url=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices%2FHistorical_sites_and_areas%2FFeatureServer&_center_zoom=13&_center_lat=33.82021800586713&_center_long=-116.53164118193216&selectedItemIdArray=3%2C4
model e2000, use feature service api, allow you view single layer at a time
https://transparentgov.net/json2tree/arcgis/js4/featurelayer_tree.html?layer_id=3&layer=Historical+Sites+Area&url=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices%2FHistorical_sites_and_areas%2FFeatureServer&_center_zoom=12&_center_lat=33.777992152946474&_center_long=-116.49478163814902&select_item_id=2&select_item_text=2+%26%23x21E2%3B+Historical+Sites+Point%3Csup+style%3D%22font-size%3A8px%22%3Epoint%3C%2Fsup%3E&select_item_type=layer
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices&select_folder=1&select_layer=3&arcgis_online_token=