is working on four other maps of Australia or parts of it. One of these is his famous eight-sheet map of Australia, scale 1:3,500,000, and the other three are concerned with exploration or based on land-property maps. (Spezialkarte von Neu-Süd-Wales nach den Kataster-Aufnahmen, later published as Spezialkarte eines Theiles von New South Wales (PGM, 12, 1866, table 13); Spezialkarte vom See’ngebiet im Inneren von Australien, later published as Das See’n-Gebiet (Lake District) und die Steinige Wüste (Great Stony Desert) im Innern von Australien (PGM, 13, 1867, table 4); Karte der Entdeckungen im Inneren Australiens, scale 1:2,500,000, which he probably chose not to publish in PGM due to all the new discoveries). In 1871/72 he published the eight-sheet map as Specialkarte von Australien in 8 Blättern in Ergänzungsheft 29 (volume VI) and 30 (volume VII). It is a superb effort to compile all available knowledge in a colored map-image that measures 194x118 cm altogether, and it reminds us of the ten-sheet map of Africa of 1863. Being Petermann he would have liked to have accompanied it with a volume containing its ten-year history of exploration and discoveries, but in order not to raise the retail price of the map he satisfied himself with merely citing the volumes of PGM where the information could be found and providing an accompanying 43-page geographical-statistical compendium by C.E. Meinicke. In 1875 a second revised edition appeared, with a small sample in PGM. We unfortunately do not find his famous six-sheet map of the United States (Neue Karte der Vereinigten Staaten vor Nord-Amerika in 6 Blättern) in the issues of PGM. It was produced for the sixth edition of the Stieler on scale 1:3,700.000, though a small part appeared in the next annual as an illustration of the exploration of Northwest Texas. Source interpretations Several times Petermann indicated that he disagreed with the reports of explorers, probably basing his arguments on reports and literature at his disposal or on sound geographic reasoning. In a map, concerning among other things lake Uniamesi, he tends to disagree with Jakob Erhardt, one of the missionaries of the Church Mission Society of London, concerning its situation and extension. Erhardt was erroneous in that he situated the lower tip of the lake around 13° South 36° East and made it bend westward to 28° East, with a probable extension to 24° East. Furthermore, he thought that Lake Victoria, Lake Tanganyika and