Concrete AA positions, usually for heavy AA artillery - 4 in a pack

Flak towers were built in cities near critical facilities. 2 towers/pack

Hangars, offices, and control tower - 4 pcs total

Bomb damaged hagars, offices and control tower (4 pieces)

Larger factory buildings 2 pieces?

Large factory buildings with bomb damage, 2 pcs

Generic city buildings, 2 each of 2 different styles

Generic bomb damaged city buildings. 2 each of 2 styles

Single railway track on a hexagon base, 4 pcs

Bomb damaged single track railway section on hexagon bases. 4 pcs

Twin track railway sections on hexagon bases, 4 pcs

Bomb damaged dual railway sections, 4 pcs

4 different clusters of railway buildings that mate with RR sections.

Bomb damaged railway buildings that fit with RR sections, 4 different pieces

Generic supply dump components on hexagon bases, 4 pcs

Generic highway bridge, 2 central spans and 2 end spans

Bomb damaged highway bridge sections, 2 central spans and 2 end sections

Pratt Truss style bridge, used for railways or higways, 2 pcs