Air navigation chart V30 (series). 27. Lat. 29° N-45* N, long. 91° E-59* E. Scale 1 in.=30 naut. m. (1:2.188.800) at Int. 37°30', contour interval 1,000, 2,000, 3,000, 5,000. 7.000, 9,000, 12,000, 15.000, 20,000, and 25,000 ft.