Satellite photomap. Panel title UTM grid. Includes notes on wavelength used, ancillary photomap of Washington region, and location diagram. "38077-H1-SI-100." Designed to be folded to 23 x 11 cm. Image controlled to identified mapped features Image No. E40109-15140 Projection and 10,000-meter grid, zone 18: Universal Transverse Mercator. 25-000-foot grid ticks based on Maryland coordinate system. To place on the predicted North American Datum 1983 move the projection lines 8 meters south and 27 meters west.