~ ee SS wa SS ~ aos 5 we « s aes = OS CAS, . 8 Ne,a =~ ~ ‘ “e ~ SA oe ok. ae > 8 The accumulation -f fr-30 24 Pittsburgh is in reasonable agreement with .:2 results obtained at HASL. At the end of 1956, Pittsburgh showed 17 me/mi2, while HASL showed 18 for the same period. - 33 - . es aK