The library's special collections document the history of geomagnetism, atmospheric electricity,
volcanology, mineralogy, and igneous petrology. Included are several thousand monographs,
observatory bulletins, expedition reports, pamphlets, offprints, and clippings. Most of the publications
are from the 19 th and early 20 th centuries, though some date as far back as the late 1700s. An extensive collection of books on exploration and travel to remote regions evokes the era of DTM’s magnetic survey expeditions.
Dutch) in physical chemistry and crystallography from the 1880s through 1930s. Many of these
originated in the private collection of the great German experimental physicist F. W. G. Kohlrausch.