to continue this work at his own expense until autumn 1868. Meanwhile, in 1867, the U.S. had acquired Alaska from Russia for 7.2 million dollars. This was uncharted country, with a fauna and flora still waiting to be explored and described, a task Dall took upon himself as a surveyor-scientist. Back at the Smithsonian, he started cataloguing the thousands of specimens he had collected during this expedition. In 1870 he published his account of his pioneering travels in Alaska and Its Resources, describing the Yukon River, the geography and resources of Alaska, and its inhabitants. Also in 1870, Dall was appointed Acting Assistant to the United States Coast Survey (renamed the United States Coast and Geodetic Survey in 1878). Dall went on several more reconnaissance and survey missions to Alaska between 1871 and 1874. His official mission was to survey the Alaska coast, but he took the opportunity to acquire specimens, which he collected in great numbers. In 1871–72, he surveyed the Aleutian Islands. In 1874 aboard the U.S. Coast Survey schooner Yukon, he anchored in Lituya Bay, which he compared to Yosemite Valley in California, had it retained its glaciers. He sent his collection of mollusks, echinoderms, and fossils to Louis Agassiz at Harvard's Museum of Comparative Zoology; plants went to Asa Gray at Harvard; archaeological and ethnological material went to the Smithsonian. In 1877–1878 he was associated with the Blake expeditions", along the east coast of the United States. The major publications on the Blake Expeditions were published in the Bulletin of the Museum of Comparative Zoology Harvard. Dall was in Europe in August 1878, sent to a meeting in Dublin of the British Association for the Advancement of Science. He took the opportunity to visit mollusk collections and meet European scholars. 1880 and after Dall married Annette Whitney in 1880. They travelled to Alaska on their honeymoon. After arriving in Sitka, his wife went back home to Washington, D.C. He began his final survey season aboard the schooner Yukon. He was accompanied, among others, by the ichthyologist Tarleton Hoffman Bean (1846–1916). In 1882 Dall contributed for the Republican Congressional Campaign Committee In 1884, Dall left the U.S. Coast and Geodetic Survey, having already written over 400 papers. In 1885 he transferred to the newly created U.S. Geological Survey, obtaining a position as paleontologist. He was assigned to the U.S. National Museum as honorary curator of invertebrate paleontology,