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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.


Trout-hatching troughs with Merrill aerating cone... Shows also tray basket of a pattern used at some trout stations, much deeper than ordinary tray intended to hold fry after hatching. Left trough with tray removed to show shower of water produced by aerating cone

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