I'll try to give a breakdown.
First sheet:
5x5 stage/tavern cellar
5x5 blue with white energy spiral/green sewer intersection
3x3 orange fiery effect/sewer to cavern transition
3x3 mob/sewer to cavern transition
2 1x1 street-level ladders up/ladder to sewer
4 1x1 barrel, crate, crates, small mob/barrel, crate, stuff in sewer, rat swarm
Second sheet:
8x8 open town square with fountain/large sewer intersection
1x2 bench/sewer
2x2 armor bazaar booth/rubble
2x2 weapon bazaar booth/rubble
2x2 produce cart/body in sewer
Third sheet:
2x8 brick street/sewer
4 2x4 brick street/sewer
2 2x2 street/sewer
2x2 mob/sewer
1x2 bench/sewer
1x2 water trough/sewer
2 1x2 flower box/sewer
1x1 grate/ladder
Fourth sheet:
4x8 rooftop/sewer
2 4x4 rooftop/sewer (one with sewer pipe emptying)
2x4 ox cart/sewer level
2x4 horsecart/sewer level
Fifth sheet:
2x4 stairs/sewer running into grate
4x8 street/sewer
2x4 street/bridge over sewer
2 4x4 street/sewer
Sixth sheet:
4x8 street/sewer with ladder, several drains into sewer
4x4 street with drain/sewer intersection
4x4 street/T-intersection sewer
2 2x4 street/sewer
All street-level is on a brick street. Except for cellar, all reverse sides have a greenish tint, flagstone walks along sewers.