This is an outstanding and quite unusual double page map of North America.  The map shows marginal understanding of most of today's US and Canada.  The Great Lakes are somewhat misshaped and feed the Mississippi. California Island is updated to be shown to be peninsular.  Buttons Bay is open-ended, allowing the possibility of an inland passage to the Pacific. The R. del Norte originates from a large lake and empties into the Mer Rouge (Gulf of California).  Some Native American tribes are shown -- Apache, Navajo, Illinois, Siox, etc. The political divisions are outdated with the continent still divided between the colonial interests of England, France and Spain.   Possibly the plate was acquired at the dissolution of the Jaillot firm in 1781, and revised by Elwe.  From Elwe's monumental 'Atlas'.