Delta Projects 6022,6051,and 6052

The Delta data is a combination of two surveys.  Project 6022 was flown in the middle of the
quadrangle and later the sides were filled in with the other two projects.

The radiometric data set for the northwest corner does not correlate with the magnetic data set.  
The line numbers and fiducials are different.  The lines were flown partly in 1976 and 1977
and may not indicate the proper year. It appears there were more lines flown in the NW than 
were used in the magnetic data set.