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Results of physical tests of road-building aggregate.
This bulletin gives the results of tests on samples of ledge rock, crushed stone, gravel, blast-furnace or smelter slag, and natural or manufactured fine aggregate which were made by teh Bureau of Public Roads to January 1, 1951.
The quality and availability of aggregate for pc concrete stone varies across Iowa. Southwest Iowa is one area of the state that is short of quality a...
Southwestern Iowa, unlike other parts of the State, does not have plentiful near-surface supplies of stone available for highway construction purposes...
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