Results of screen tests on "wash" samples from borings in silica sand pit of Standard Silica Company, Ottawa, Illinois
Sieve analyses and crushing strength of cores
Silica Deposits--Illinois--La Salle County
Manuscripts, maps, fieldnotes, and photographs may be viewed in-house only. Please contact the ISGS Special Collections Curator, Anne Huber, for an appointment at 217-300-0005 or email firstname.lastname@example.org Monday thru Friday, 8am-noon or 1pm-5pm.