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   In connection with the chemical exhibits, a number of recent books are absolutily necessary in my sectional library.  The processes of chemical manufacture are constantly changing, and not only are recent books of reference required, but several of the leading chemical journals should be on file in my office.  A requisition for the purchase of several such books has been sent in, but I am not aware that it has been acted upon.
   I have prepared a few labels of chemicals to test the working of the plan already proposed for this exhibit in a letter which you have read.  I find the plan quite practicable & open to further development
                     Respectfully
Mar 8 of 89                    R Hitchcock