Oregon Territory / Illman & Pilbrow sc.Illman & Pilbrow[1836]"48" at lower right corner in margin."Entered according to act of Congress in the year 1836 by Illman & Pilbrow in the Clerk's office of the District Court for the Southern District of New-York."Appears in Burr's A new universal atlas. 1835.Prime meridians: Washington and Greenwich.cartographic