- The layman looks at world religions by Niels Christian Nielsen, 1962
- Recherches Sur Les Fonctions De Bernoulli by Niels Nielsen, 1915-01-01
- Mediaeval Scandinavia 1975
- Atlas of Denmark;: Text and photographs by Niels Nielsen, 1949
- Individual and environment;: A psychiatric-psychological investigation of monozygotic twins reared apart (Acta psychiatrica Scandinavica) by Niels Juel-Nielsen, 1965
- Ten years later: A comparison between census studies of patients in psychiatric institutions in Denmark in 1957, 1962 and 1967 (Acta Jutlandica) by Niels Juel-Nielsen, 1969
- Die Gammafunktion. Band I: Handbuch der Theorie der Gammafunktion. Band II: Theorie des Integrallogarithmus und Verwandter Transzendenten. by Niels. NIELSEN, 1965
- Atlas Over Danmark 1 (Atlas of Denmark) Landskabsformerne (the Landscapes) by Nielsen Niels, 1949
- Mediaeval Scandinavia 1969
- Individual and Environment: Monozygotic Twins Reared Apart. by Niels. Juel-Nielsen, 1980
- ATLAS OVER DANMARK: ATLAS OF DENMARK II BEFOLKNINGEN THE POPULATION. by Niels. Nielsen, 1961
- Traite Elementaire des Nombres de Bernoulli by Niels Nielsen, 1923
- Handbuch der Theorie der Cylinderfunktionen (German Edition) by Niels Nielsen, 1904-01-01
- Matematiken i Danmark: bidrag til en bibliografisk-historisk oversigt (Danish Edition) by Niels Nielsen, 1910-01-01
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