130 
Table 3. Unusable Data Sources. 
The facilities listed in Table 3 are those that were uncovered 
by the project but which were adjudged to be unsuitable for inclusion 
in Tables 1 or 2. One of three situations described the reason for 
deletion. Most of the sources were contacted, but the data recorded by 
the installations were of such short record or of such a nature that 
there was no immediate future use deemed possible for it by the investi- 
gators. These cases are listed in the first column. In a few cases, 
data of interest to the project are taken, but for technical reasons, 
such as intake location or instrument exposure, they were considered un- 
representative. These are shown in the second column. In a few cases 
the existence of potential data sources was determined, but for a 
variety of reasons no contact with source authorities was possible. 
Only 16 cases of this type occurred -- 1.4 per cent of the total of 1177 
sources, 
