Subject
- Lea, M. Carey (Mathew Carey), 1823-18971
- Leonardo, da Vinci, 1452-15191
- Liquid chromatography1
- MacDiarmid, Alan G., 1927-20071
- Manhattan Project (U.S.)2
- Manzanar War Relocation Center1
- Mauve1
- McAfee, Almer McDuffie, 1886-19721
- McCarthy, J. P. (Joseph Priestly), 1933-19951
- Medical care1
- Medicine, Ancient1
- Mendeleyev, Dmitry Ivanovich, 1834-19072
- Microscopy1
- Miescher, Friedrich, 1844-18951
- Milk--Pasteurization1
- Mineral waters1
- Morton Salt Company1
- Mummies1
- Nakanishi, Kōji, 1925-20191
- Nanochemistry1