Report of Committee on school inquiry, Board of estimate an apportionment, city of New York .. . C/3 D <^ Pi< < a :j z z < w a o p n a 3 J N<^ 2 S u 2 if; ^ D20 EDLCATIOXAL IXrESTIGATIONPLATE IV. WALLACE AND TIERNAN PUMP USED IX LATER EXPERIMENTS IN COLLECTION OF SAMPLES FOR ENUMERATIONOF DUST AND BACTERIA - THE AIR OF NEW YORK CITY SCHOOLS 621 r^ FLATLmaW\o\Orf Driven Air Sampler nc - xzo V. D C.

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Keywords: ., bookauthornewyorkn, bookcentury1900, bookdecade1910, bookyear1913