Names
- Lamont, Thomas W (Thomas William), 1870-19481
- Lamont-Doherty Earth Observatory -- History1
- Lamont-Doherty Geological Observatory -- History1
- Lavery Granite Co., inc1
- Lazzari & Barton Co1
- Leland & Hall Co1
- Levison, J. J (Jacob Joshua), 1881-19611
- Lewis, Colt, Abro1
- Little & O'Connor1
- Lord & Hewlett1
- Lutyens, Edwin Landseer, Sir, 1869-19441
- Manhattan Monument Co1
- Marc Eidlitz & Son1
- Marcotrigiano, Nicholas1
- Mayers, Murray & Phillip1
- Mayers, Murray and Phillip, Bertram G. Goodhue Associates1
- McDonnell & Sons1
- McNeel Marble Company (Marietta, Ga.)1
- Mead, George L1
- Milne & Chalmers, inc1