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CONTENTdm, along with all of OCLC's services, will be down approximately 15 hours for a system upgrade. This will occur from 9:00pm PST on Friday, January 2, to around noon on Saturday, January 3.


Mayflies on the gauge house on the big dam at Keokuk, Iowa, at 5:30 a.m., July 14, 1916. They were about equally numerous all along the dam, which is nearly a mile in length

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