2. Brunswick Center South
3. Clark & Pine Nature Preserve
3a. Clark & Pine East
4. Clark & Pine Dune and Swale
5. Clark & Pine general Refractory
6. Clark Junction
7. Clark Junction East
8. Cline Avenue Dune and Swale
9. DuPont Natural Area
10. Explorer Pipeline
11. Gary Enterprise Zone
12. Gary Works
13. Gibson Woods
14. Ivanhoe Dune and Swale
15. Ivanhoe South
16. Miller Woods and Dunes
17. Penn Central
18, 19 Tolleston Ridges
20. Tolleston Woods
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21. Big Marsh
22. Deadstick Pond
23. Eggers Woods Forest Preserve
24. George Lake Woods
25. Grand Calumet Lagoons
26. Grand Calumet Tern site
27. Hegewisch Marsh
28. Heron Pond
29. Indian Ridge Marsh North
30. Indian Ridge Marsh South
31. Lake Calumet
32. Hammond Bird Sanctuary
34. Roxanna Marsh
35. Wolf Lake
36. Fay's Point
37. Oxbow Park
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38. Burnham Prairie
39. Calumet City Prairie
40. Dolton Prairie
41. Lakeshore Prairie
42. Powderhorn Lake Prairie
43. Sand Ridge Nature Preserve
44. Thornton Fractional High School Nature Preserve
45. Wentworth Prairie
46. Wentworth Woods Forest Preserve
47. Van Vlissingen Prairie
48. Coulter Sand Prairie
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1. International Harvester/Wisconsin Steel
2. South Works, USX
3. Youngstown Sheet & Tube (IL)
4. Youngstown Sheet & Tube (IN)
5. State Line Generating Station
6. Standard (Amoco) Oil Co.
7. Inland Steel
8. American Bridge Works
9. Indiana Steel Works, Gary
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10. Altgeld Gardens
11. Trumbull Park Homes
12. Whiting
13. Marktown Historic Districit
14. US Steel Workers Housing Historic District
15. Gary Center Historic District & Gary Land Company Building
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16. Cal-Sag Channel
17. Vincennes Trace
19. Chicago, South Shore, South Bend Line
20. Thomas J. O'Brien Lock & Controlling Works
21. Bridge (double cantilever)
22. Chanute Hill at Miller Beach
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23. Pullman Historic District
24. Memorial Day Massacre Site & Monument/Republic Steel
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25. Indian Boundary Line
26. Foster House and Stable
27. Stony Island
28. IL-IN State Line Marker
29. Wolf Lake at NIKE sites
30. Polish Army's/Veteran's Post No. 40
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