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12. Laws relating to the National Park Service, the national parks and monuments
13. A lecture on our national capital by Frederick Douglas : Study and discussion aids for the secondary student
14. Lehman Caves National Monument, Nevada
15. Life in the National Park Service
16. Limnology of Blue Mesa, Morrow Point, and Crystal Reservoirs, Curecanti National Recreation area, during 1999, and a 25-year retrospective of nutrient conditions in Blue Mesa Reservoir, Colorado
17. Lincoln birthplace
18. Lincoln Boyhood National Memorial, Lincoln City, Indiana
19. Lincoln Home National Historic Site : preliminary alternatives description
20. Lincoln Home National Historic Site draft general management plan/environmental impact statement
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