1: Uploading initials

4: Bellhop's burdens

8: Facial arch

12: 'Don't stop'

13: ___ nitrate

14: Distinctive atmospheres

16: Sandpaper component

17: Peru's capital

18: Colorful aquarium inhabitant

19: Hour div.

20: Like any number finishing with '9'

21: Pot ingredient?

23: Stitch up

24: Subway slug

26: Electrical unit

28: Barrel of suds

30: Incidentally, in Netspeak

32: British baby buggy

36: Scandal suffix

39: Curly coif

41: Angelic aura

42: Have markers out

43: Jib and spanker

45: French dip dip

46: Escapade

48: Home of heroes?

49: Legs, slangily

50: Unit of force

51: A pop

52: Two-piece piece

54: Opposite of paleo-

56: Disconcert

60: Aardvark's tidbit

63: Pose for a pic

65: Prohibition

67: 'Whew!'

68: Rows between houses?

70: Finder's cries

72: Village or hamlet

73: Inner legbone

74: Reserved parking space, e.g.

75: ___ fixe

76: Sailor's outfit

77: Spots

78: Debussy's 'La ___'

1: Leaf in a book

2: Mammoth feature

3: Capital of Phoenix?

4: Like some eagles

5: In the thick of

6: Place for P.E.

7: Trellis piece

8: Group of things

9: Cry over spilled milk

10: Table scraps

11: Hard or soft addition

12: CEO, CFO, etc.

15: Coping device

20: Undivided

22: 'In what way?'

25: Squeeze (out)

27: Speed meas.

29: Brake neighbor

30: Smoker's choice

31: Causeway fee

33: Indian king

34: Grad

35: Rolling stone's lack, proverbially

36: Olympian's quest

37: On vacation, perhaps

38: Little gull

40: Lose strength

44: Sis or bro

47: Barbie's ex-beau

49: Debatable gift

51: Polynesian paste

53: Campaigned for office

55: Piece with a purpose

57: Place to call home

58: More ticked

59: Ballyhoo

60: Sternward

61: No in Nuremberg

62: Oktoberfest horn

64: A runner may break it

65: Like a dangerous wire

66: Responds correctly on 'Jeopardy!'

69: N.L. Central, e.g.

71: Attention getter

72: Lower, as lights