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.. " <br />Table 2. Time Periods Used in the Green River Study <br />for the Years 1978 to 1987. <br />Time Julian Calender Julian Calender <br />Period Start End <br />MAR 1-15 60. 74. <br />MAR16-31 75. 90. <br />APR 1-15 91. 105. <br />APR16-30 106. 120. <br />MAY 1-15 121. 135. <br />MAY16-31 136. 151. <br />JUN 1-15 152. 166. <br />JUN16-30 167. 181. <br />JUL 1-15 182. 196. <br />JUL16-31 197. 212. <br />AUG 1-15 213. 227. <br />AUG16-31 228. 243. <br />SEP 1-15 244. 258. <br />SEP16-30 259. 273. <br />