12 
meteorological and lake state data, Coast Guard installations are divi- 
ded into two categories: those making regular reports every six hours 
to the U. S. Weather Bureau, and those which take four-hourly observa- 
tions; most of the latter are retained by the Coast Guard. 
Data from the former category are obtainable from the National 
Weather Records Center at Asheville, and from the latter are obtainable 
from U. S. Coast Guard Headquarters, Washington, D. C. Coast Guard 
station personnel retain copies of the meteorological logs for a period 
of twelve months; hence, data for any immediately preceding year may be 
obtained directly from the station in question. In Table 1, the six- 
hourly and four-hourly stations are so designated. 
6. Naval Air Stations; U. S. Air Force Bases. Data are filed with 
and obtainable from the National Weather Records Center at Asheville. 
7. Michigan municipal water treatment plants. All plant records 
are filed with the Michigan Department of Health. Information on Upper 
Peninsula plants may be obtained from the Michigan Department of Health, 
19th Street and 13th Avenue North, Escanaba, Michigan. Information on 
Lower Peninsula plants is obtainable from the Michigan Department of 
Health, Division of Engineering, Lansing 4, Michigan. 
In Column 3 of Table 1, contacts for Michigan water treatment 
plants are indicated by either Escanaba or Lansing, to specify the data 
location. 
C. Modification of Contact Procedure 
In regard to municipal water treatment plants located in Ohio, a 
modified contact precedure is recommended. Chemical data obtained at 
the plants arefiled with the Ohio State Department of Health at Columbus, 
but some physical data may be retained at plants and may be obtained dir- 
ectly from the individual plant operators. Initial inquiries should be ad- 
dressed to the Chief Engineer, State Department of Health, 301 Ohio 
Departments Building, Columbus, Ohio. 
In Column 3 of Table 1, contacts for Ohio water treatment plants 
will indicate the name of the superintendent of the plant, followed by 
Columbus. 
D. Period of Record 
The number of years over which records are available has been as- 
certained for a large number of the located data sources. Under the 
period of record for a particular agency, a specific date followed by a 
dash indicates that data are available from that year to the present. 
Records pertaining to U. S. Weather Bureau First and Second Order and 
Cooperative stations indicate the amount of data available in terms of 
total years. These are not necessarily consecutive years; hence, ascer- 
tainment of any missing record is accomplished only by examination of 
the complete history of the station in question. Accordingly, periods 
of record for U. S. Weather Bureau stations are entered in Table l as 
total years of data, and specific dates are not given. 
