1. Catchall abbr.
2. Centers of activity
3. It's a wonder
4. Afore
5. Tourist's tote
6. Bottomless pit
7. Yesteryear
8. Slugger Mel
9. Cross-referencing word
10. Emotional pang
11. Catcall
12. Bounder
13. Mir launcher
19. Prepped
21. R-rated, maybe
24. At one time, at one time
25. Money substitute
26. Container weight
27. Skilled corp group
28. Condor condo?
29. It's a wonder
30. Dead to the world
31. In deep water?
32. Old Testament king
33. Combine
36. Flight data, briefly
37. Feudal estate
39. Ski trail
40. Mouth, in slang
42. Richard III's plea
43. Catch, as in a net
45. Unloads
46. Gofer
47. Oklahoma city
48. Heroin, slangily
49. Alpine transport
51. A pop
52. Deuce topper
54. Comic DeLuise
55. A Gershwin
56. Place for sweaters?