Machine driving of wooden and steel highway guardrail posts under adverse conditions

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100	1	⊔	‡aGatchell, Charles J.
245	1	0	‡aMachine driving of wooden and steel highway guardrail posts under adverse conditions, ‡cby Charles J. Gatchell and Edwin L. Lucas.
260	⊔	⊔	‡aUpper Darby, Pa., ‡bNortheastern Forest Experiment Station, ‡c1971.
300	⊔	⊔	‡a18 p. ‡billus. ‡c23 cm.
490	0	⊔	‡aU.S.D.A. Forest Service research paper NE ; ‡v212
500	⊔	⊔	‡aCover title.
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aPile drivers.
650	⊔	0	‡aRoads ‡xGuard fences.
700	1	⊔	‡aLucas, Edwin L.,
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