Hedin prepared a scientific publication for each of his expeditions. The extent of documentation increased dramatically from expedition to expedition. His research report about the first expedition was published in 1900 as "Die geographisch-wissenschaftlichen Ergebnisse meiner Reisen in Zentralasien 1894–97" (Supplement 28 to "Petermanns Mitteilungen"), Gotha 1900. The publication about the second expedition, "Scientific Results of a Journey in Central Asia", increased to six text and two atlas volumes. "Southern Tibet", the scientific publication on the third expedition, totalled twelve volumes, three of which were atlases. The results of the Sino-Swedish Expedition were published under the title of "Reports from the scientific expedition to the north-western provinces of China under leadership of Dr. Sven Hedin. The sino-Swedish expedition". This publication went through 49 editions.