Subject
- Koninklijke Nederlandse Akademie van Wetenschappen2
- Kruyt, H. R. (Hugo Rudolph), 1882-2
- Kuhn, Richard, 1900-19672
- Laboratories--Equipment and supplies2
- Landolt, H. (Hans), 1831-19102
- Lawyers2
- Le Blanc, Max Julius Louis, 1865-2
- Lebedev, Aleksandr Nikolaevich, 1869–19372
- Lehmann, O. (Otto), 1855-19222
- Lewis, Gilbert Newton, 1875-19462
- Libraries2
- Library catalogs2
- Lichty, David Martin, 1862-19422
- Life insurance2
- Luggins, Hans, 1863-18992
- Lunge, Georg, 1839-19232
- Mangold, Paul2
- Marriage2
- Marx, Erich Anselm, 1874-19542
- Mathematical notation2