Issue does not carry date of publication. Generally covers May 1, 1950 - April 30, 1951. Time periods for which statistics are given occasionally vary.
Yaquina Bay and River waters were sampled in May, 1951 "to determine the suitability of these waters for the propagation of fresh market shellfish." (p.1) Found that the intensity and extent of pollution had increased "markedly" since the previous survey of March, 1948. "The waters of the bay are grossly...