Johan Frederik Steffensen died in 1961.
Johan Frederik Steffensen was born in 1873.
Johan Frederik Schlegel died in 1896.
Johan Frederik Thorne died in 1854.
Frederik Johan van Baer died in 1713.
Carl Johan Frederik Jakhelln died in 1987.
Johan Frederik van Oordt died in 1852.
Johan Georg Frederik Ræder died in 1909.
Johan Frederik Rudolph van Hooff died in 1816.
Johan Frederik Schlegel was born in 1817.
Johan Frederik Thorne was born in 1801.
Carl Johan Frederik Jakhelln was born in 1914.
Johan Frederik Knudzen Nødbæk was born in 1787.