Notes on Flight of 23/6/38 Course to site of Prauw Bivak on the Idenburg, thence round face of range past Doorman Peak, and across the mouth of the Dika Valley, thence turned† S. over frightfully rough high ranges to the Central Range. Followed along top of Central Range to Mt. Wilhelmina, passed round S. side of peak and thence back over Habbema Meer. From Habbema we flew on a course approximately N.W.E. over a high timbered, partly swampy and grassy plateau: and over the heavily populated valley of the Baliem a little to the west of where it opens out into a vast flat grassy valley with big popula-tion; and in ten minutes flight from Habbema found a new lake about 3 miles east of our course. From the new lake we went out to the Idenburg, which was followed up a distance of† miles to the junc-tion of Wal River. From there we turned back down river to examine a possible camp site at a point of low mountains in line with the new lake and Lake Habbema: thence back to Hollandia. The big populated valley of the Baliem a fine discovery. The population there must equal any in the Mt. Hagen area.