Soil exploration and mapping. Presented at the twenty-ninth annual meeting, 1949

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110	2	⊔	‡aNational Research Council (U.S.). ‡bHighway Research Board.
245	1	0	‡aSoil exploration and mapping. ‡bPresented at the twenty-ninth annual meeting, 1949.
260	⊔	⊔	‡aWashington, ‡c1950.
300	⊔	⊔	‡aiii, 121 p. ‡billus., diagrs. maps (part fold. in pocket) tables. ‡c26 cm.
490	0	⊔	‡aIts Bulletin ‡vno. 28
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aSoil mechanics ‡zUnited States.
650	⊔	0	‡aCartography
650	⊔	0	‡aSoil surveys ‡zUnited States.
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