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1
Xylidine (C,C-diemethylaniline): Its toxicity and potential..
United States congressional serial set ; serial set no. 11188;House document / 80th Congress, 1st session. House ; no. 54
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2
Toxicology of beryllium, by Frances Hyslop, assistant chemi..
United States congressional serial set ; serial set no. 10734;House document / 77th Congress, 2nd session. House ; no. 910