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- Labor unions. (5)
- Lakes & ponds. (135)
- Landscape photographs--Reproductions. (2)
- Landscape photographs. (247)
- Landslides. (2)
- LaSalle Hotel (Chicago, Ill.) (1)
- Lawyers. (3)
- Leaning Tower (Pisa, Italy) (2)
- Leather industry. (2)
- Lee, Fitzhugh,--1835-1905--Staff. (1)
- Legislative bodies. (5)
- Legislators. (15)
- Librarians. (5)
- Libraries. (7)
- Library of Congress Thomas Jefferson Building (Washington, D.C.) (62)
- Library of Congress--People. (2)
- Lighthouses. (1)
- Lindbergh, Charles A.--(Charles Augustus),--1902-1974--Public appearances. (1)
- Livestock. (3)
- Locks (Hydraulic engineering) (31)
- Louisiana Purchase Exposition--(1904 :--Saint Louis, Mo.)--Buildings (1)
- Louisiana State University (Baton Rouge, La.)--Buildings. (1)
- Louvre (Paris, France) (2)
- Lumber industry. (26)
- Lusitania (Steamship) (1)
- Lutherans. (1)