1. Thurmond
6. Sit
10. Wallach and others
14. Odor
15. Shark
16. ----, ----,Tekel, Upharsin
17. Inventor of the heliocentric theory of the universe
19. What Major Hoople might say upon seeing 63 Across
20. Gossip
21. The purpose of many an ancient observatory
23. Abbreviation in an airport
25. First person on the course?
26. Farmer's and Information Please
31. Professional archaeological association in the US
32. Daytime fare
33. National Review Online
34. ----- throat
38. Kelly's oppossum
39. Opinion
42. A tad
43. Form of wheat
45. Nest egg
46. O'Neill's daughter
47. Tree
49. Canopus or Julian
51. I, rearrangement servant (Internet ------- Server)
55. Take to the slopes
56. Parceled
58. Winter home?
62. Book of the Old Testament
63. Big rock art clock?
66. Descendant of the builders of 63 Across
67. Top drawer
68. Big old German coin
69. Brief period of time
70. Schnoz
71. Sneakier

1. Bag
2. Ilium
3. Lasso
4. Warning
5. Purple ------
6. Paste from 44 Down
7. Shark (again?)
8. Row
9. Less strenuous
10. Editing
11. On the up-and-up
12. Ludicrous
13. Water-tolerant plant
18. Swimming
22. Where you tell the time from at 63 Across
24. Plot of land
26. Those'll be the death of Cleo
27. Iteration
28. Wizard
29. Defenders
30. Pertaining to sound
35. Crucifix
36. Italian volcano
37. Pre-Letterman talker
40. Periods
41. Not silent
44. See 6 Down
48. Bob Dole, Alf Landon, or Dwight Eisenhower
50. Crazy ------
51. Inventors of the Canopus version of 49 Across
52. Mother of pearl
53. Upper story
54. Cry of a child?
57. Begins to wear
59. Loyal
60. Sole
61. Curve
64. Born
65. To be human