00932cam a22002531  4500001001300000003000400013005001700017008004100034010001700075035001900092040004300111042001200154050001500166100003200181245007400213260007600287300003500363490006800398500011900466650001400585650001200599700005000611999001700661gs 14000470 DLC20260227111315.0780714s1913    iaua         s000 0 eng c  ags 14000470   a(OCoLC)4053812  aU. S. Geol. survey. Library.cGATdDLC  apremarc00aTN939b.A31 aAgg, Thomas Radford,d1878-14aThe use of Iowa gravel for concrete,cby T. R. Agg and C. S. Nichols.  aAmes, Ia.,bIowa State College of Agriculture and Mechanic Arts,c1913.  a31 p.billus., diagrs.c22 cm.0 aBulletin 34, Engineering Experiment Station. Good Roads Section  aAt head of title: Bulletin of Iowa State College of Agriculture and Mechanic Arts, vol. XII, Dec. 1, 1913, no. 20. 0aConcrete. 0aGravel.1 aNichols, Charles Sabin,d1883-ejoint author.  c25363d25363