Subject
- Laboratories--United States1
- Lactate dehydrogenase--Diagnostic use1
- Ladder networks14
- Laser-induced fluorescence1
- Lathes3
- Leeds & Northrup Company2
- Leeds and Northrup Company1
- Life support systems (Space environment)1
- Light amplifiers4
- Light bulbs1
- Lightning1
- Lightning-arresters1
- Linde Air Products Company1
- Liquid chromatography68
- Liquid crystal displays3
- Liquid scintillation counting40
- Liquid scintillators33
- Lithium--Analysis1
- Los Angeles Chamber of Commerce12
- Los Angeles County (Calif.). Air Pollution Control District1