Oscar Ljungström (1868–1943) was a Swedish archivist, officer, and author.
Ljungström at the time of the Finnish Civil War (1918).
Jonas Patrik Ljungström was a Swedish cartographer, geodesist, and teacher at the Royal Institute of Technology.
Jonas Patrick Ljungström, c. 1870s
Technical design of the distance tube for land surveying.
Jonas Patrik Ljungström with a unit of the distance tube land surveying precision instrument (1877).