VT-21 



Several hundred thousand items from sources other than those 

 mentioned above have also been entered. 



As the process of collectinq information developed, revisions in the 

 descriptor list became necessary. In certain cases descriptors 

 listed were not available on a basis broad enouqh to be useful, 

 and an alternate descriptor which would provide the same type of 

 information was substituted. In other cases no alternate descriptor 

 could be selected. Table VI. 1.4 lists these and contains comments on 

 impact of their loss on manaqenent nlanninq. 



In summary, some data are available but have never been comoiled; 

 some data are available but will never be released; some data 

 are available in massive quantities bjjt have never been extracted; 

 and other data have never been taken at all. Numerous examples of 

 each kind were encountered. Where sufficient data were not avail- 

 able to describe on estuarine attribute adequately, alternative 

 data were qathered and analyzed. 



