Subject
- Los Alamos Scientific Laboratory1
- Low-calorie diet1
- Lucite1
- Lunar Society of Birmingham (England)1
- Lydia E. Pinkham Medicine Company1
- Lyell, Charles, Sir, 1797-18751
- Lyman, Henry M. (Henry Munson), 1835-19041
- Macartney, James1
- Magic tricks1
- Manufactures1
- Manufacturing Chemists' Association (U.S.)1
- Manufacturing industries1
- Margarine1
- Marketing1
- Maryland--Edgewood (Harford County)1
- Mass spectrometry1
- Materia medica1
- Materia medica, Vegetable1
- Materials science1
- Maxim, Hudson, 1853-19271