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DATA-COLLECTION SITES Lists of data-collection sites and the kinds of hydrologic data being collected at each, for fiscal year 1987, are given as follows: Table 1, streamflow and reservoir stations; table 2, water-quality stations; table 3, sediment stations; and table 4, ground-water observation wells. Lists of data-collection sites that were discontinued during fiscal years 1985 and 1986 are given in tables 5-8. The station numbers for the stations listed in tables 1-3 conform with the standard downstream order for listing stations within each major river basin. The first two digits of the assigned eight-digit number, such as 06207500, identifies the major river basin in which the stream resides. The digits '06' refer to the Missouri River Basin. The remaining six digits identify the relative position of the station, with numbers increasing in the downstream direction. Two stations listed in table 2 and the observation wells listed in table 4 have 15-digit station numbers. The first six digits are the latitude in degrees, minutes, and seconds. The next seven digits are the longitude in degrees, minutes, and seconds. The last two digits indicate a sequence number. The local well numbers listed in table 4, ground-water observation wells, are based on the Federal system of land subdivision. A detailed explanation of this system can be found on the page preceding table 4. The wells are listed in numerical order by county. Abbreviations and codes are used to conserve space in the tables. Explanations of the abbreviations and codes precede each table. The location of streamflow, reservoir, water-quality and sediment stations are shown in figure 4. The station numbers are abbreviated by not showing the two-digit number and the last two digits if zero. The location of ground-water observation wells are shown in figure 5. 10