
1) Archaeological feature 2) British jazz ensemble 3) Civil engineering term 4) Faber and Faber book
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https://www.crosswordclues.com/clue/earthworks
[archaeology] In archaeology, earthworks are artificial changes in land level, typically made from piles of artificially placed or sculpted rocks and soil. Earthworks are often known as barrows in England, and mounds in North America. Earthworks can themselves be archaeological features or they can show features beneath the surface. == Type...
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http://en.wikipedia.org/wiki/Earthworks_(archaeology)
[company] Earthworks is a professional audio equipment company founded by David E. Blackmer in the late 1980s after he left dbx to sell studio microphones, preamplifiers and studio reference monitors. Their products are based on Blackmer`s research into ultrasonic frequencies in sound reproduction and his claims that the time resolution of ...
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http://en.wikipedia.org/wiki/Earthworks_(company)
[engineering] Earthworks are engineering works created through the moving or processing of parts of the earth`s surface involving quantities of soil or unformed rock. The earth may be moved to another location and formed into a desired shape for a purpose. Much of earthworks involves machine excavation and fill or backfill. == Types of exca...
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http://en.wikipedia.org/wiki/Earthworks_(engineering)

Sculptural representation of earth, rocks or plants.
Found on
http://www.encyclo.co.uk/local/20471

A large series of ditches dug around defended settlements, and linear ditches dividing up the countryside. Also see MAIDEN CASTLE
Found on
http://www.encyclo.co.uk/local/20686
No exact match found.