15: Historic river of Paris
17: Word before sheet or session
18: The Amish, the Shakers, et al.
19: Many fast-food workers
28: Upper or Lower, in New York
32: Possible answer to 'Where are you?'
37: SWAT team specialists
52: Palindromic preposition
53: 'Sweet Pea' singer Tommy
56: Job that involves ladder climbing
70: Repetitive computer program