"J." . "Jakobus" . "J. J. Kruger"@en-US . "Kruger, J. J. (Johannes Jacob)" . "Krüger" . "Kruger" . . "Jacobus" . "J. J. Krüger" . "Kruger, J. J. (Johannes Jacobus)" . "J J. Kruger" . "Jacob" . "Johannes Jacobus Kruger" . "KRÜGER, J. J., Naturalist" . . "Naturalist J. J. KRÜGER" . "J" . . "Johannes Jakobus Kruger" . "Johannes" . . "Johannes Jacob Kruger" . "KRÜGER" . "J." . . .