Reference for https://irmaservices.nps.gov/v2/rest/unit/collections

Gets the list of all Unit Collections and the Units belonging to each.

Url: https://irmaservices.nps.gov/v2/rest/unit/collections

HTTP Method: GET

This operation supports JSONP responses. The callback function can be specified using the "callback" Url query parameter.

Message direction	Format	Body
Request	N/A	The Request body is empty.
Response	Unknown	The Response body cannot be inferred.