Document xz7zpYXq3NOERZDoeGvbqe3G6

Page 3376 1 At less than five million particles, there 2 were three doubtful cases. I mean, these were people 3 that have, probably, equivocal chest X-rays. 4 Below 2.5 million particles per cubic foot, 5 there were no cases at all. So they suggested that a 6 level of five million particles per cubic foot might 7 be the numerical value of dust that one needed to 8 control in order to prevent disease. 9 Q That is taking us up to the '30s and 10 1940s? 11 A Up through the end of the '30s, yes. 12 Q Now, these studies that you mentioned, were 13 they published? 14 A Yes. 15 Q Were they just sent to industry? 16 A No, they were published, you know -17 Merewether's report was a publication of the British 18 home office, but it was also published in the American 19 and industrial medical literature. 20 Lanza's report was in the American medical 21 literature.