Soil study, 1967
Soil study, 1967 |
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| Before construction plans could be finalized, engineers had to make hundreds of test borings throughout the region, learning in detail the composition of the soil and rock beneath streets and buildings., Mueser, Rutledge, Wentowrth & Johnson. Final Report, Subsurface Investigation Vol. 3. December 1967. DCPL. |
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