Part of the boundary between the United States and Texas, from Sabine River northward to the 36th mile mound / drawn from the notes of survey and copied for the use of the commissioners under the Convention of 25th April 1838, by J. Edm.d Blake 1st Lieut.Blake, Jacob Edmund, 1811 or 12-18461842?]"Though the map ... has an 1840 date, it appears from a letter of J.H. Overton, United States Commissioner, dated Opelousas, Louisiana, August 10, 1841 ... and the reply of October 1, 1841 ... that the maps ... had not been forwarded at that time. However, they had been received by January 15, 1842 ..and that they were issued by March 17, 1842, is shown by the reprintings of them accompanying the President's message of that date"--Streeter, Bibliographof Texas, 1438.At head of title: A.2.From the Streeter collection.Relief shown by hachures.Three parallel sections of 12 miles each.cartographic