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All answers having "Earth mover" as clue:

3 Character Answers:

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ANT

HOE



4 Character Answers:

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HOER

PLOW



5 Character Answers:

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DOZER

QUAKE

SPADE



6 Character Answers:

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SHOVEL

TREMOR



7 Character Answers:

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BULLDER



9 Character Answers:

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BULLDOZER

LANDSLIDE



11 Character Answers:

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STEAMSHOVEL