NW Elson Lagoon, 156 deg.35'45", 71 deg.20'27", 0 ft. (Sept. 2, 1952). Point Barrow, 156 deg.40'40", 71 deg.19'30", 8 ft. (Sept. 9, 1952). Point Barrow, 156 deg.35'45", 71 deg.19'30", 8 ft. (Sept. 9, 1952). Point Barrow, 156 deg.39'40", 71 deg.19'03", 6 ft. (Sept. 3, 4, 7, 8, 1952). West side Salt Water Lake [Lagoon], 156 deg.42'00", 71 deg.18'41", 4 ft. (June 18, 19, 1952). 1/10 mi. W Salt Water Lake [Lagoon], 156 deg.42'02", 71 deg.18'26", 10 ft. (June 16-19, 1952). 9/10 mi. E and 8/10 mi. N Barrow Village, 156 deg.44'15", 71 deg.18'20", 8 ft. (June 22, 23, 1952). 1-4/10 mi. S and 6/10 mi. E Barrow Village, 156 deg.45'25", 71 deg.16'20", 20 ft. (June 20, 1952). 7-1/2 mi. S and 7 mi. W Point Barrow, 156 deg.49', 71 deg. 17' (September 6, 1952). Teshekpuk Lake (1951: July 29-Aug. 4). Shown on a map, titled "Trails and Caches 1951 Season, Naval Petroleum Reserve No. 4, ... traced and reproduced from U. S. Geological Survey Maps, March 1945, compiled from AAF Trimetrogon photography for Aeronautical Chart Service." NE Teshekpuk Lake, 153 deg.05'40", 70 deg.39'40", 12 ft. Topagaruk (1951: July 5-10). Named on map "Trails and Caches 1951 ..." cited immediately above, but is actually seven miles due south of name shown on that map. Correct position is 155 deg.55', 70 deg.34', 10 feet; but specimens are incorrectly labeled 155 deg.48'.... Kaolak River (1951: July 12-18). River shown on map cited above under Teshekpuk Lake. [Actual camp on] Kaolak River, 159 deg.47'40", 70 deg.11'15", 30 ft. Kaolak (1951: July 20-27). Longitude and latitude computed from map cited above under Teshekpuk Lake. Kaolak, 160 deg.14'51", 69 deg.56'00", 178 ft. Gavia Lake (Aug. 19-23, 1952). Longitude and latitude computed from World Aeronautical Chart (63) Brooks Range, U. S. Coast and Geodetic Survey, 5th ed., February 2, 1949. Gavia Lake, N White Hills, 150 deg.00', 69 deg.35', 460 ft. Umiat (1951: Aug. 30-Sept. 4. 1952: June 24-July 3, 18-23, Aug. 16-19, 23, Sept. 12). Longitude and latitude taken from U. S. Geological Survey Topographic Map. Bearpaw Creek, 1-7/10 mi. E and 1-7/10 mi. N Umiat, 152 deg.04'50", 69 deg.23'30", 550 ft. (June 28, 1952). 1-3/10 mi. E and 1-3/10 mi. N Umiat, 152 deg.05'30", 69 deg.23'12", 350 ft. (June 26, 27, 1952). 9/10 mi. W and 9/10 mi. N Umiat, 152 deg.10'58", 69 deg.22'53", 380 ft. (June 29, 30, July 1, 1952). 1-1/2 mi. W and 3/4 mi. N Umiat, 152 deg.08'10", 69 deg.22'18", 370 ft. (Aug. 30, Sept. 4, 1951). Umiat, 152 deg.08', 69 deg.22', 337 ft. (Aug. 19, 1952). Umiat, 152 deg.09'30", 69 deg.22'08", 352 ft. (June 24, 26, July 21, 22, 1952). As shown on fig. 1 a reconnaissance flight was made from Umiat to Sadlerochit River and return (July 22, 1952). Lake Schrader-Lake Peters (July 23-Aug. 16, 1952). Longitudes and latitudes taken from map entitled "Preliminary Copy," U. S. Petroleum Reserve No. 4, U. S. Geological Survey, March 1948, scale 1-6900.