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Schmidt and Schelleng

One of the first articles ever written about using least squares to close cave survey loops appeared in the NSS Bulletin in 1970. It was titled "The Application of the Method of Least Squares to the Closing of Multiply-Connected Loops in Cave or Geological Surveys," and was written by V.A. Schmidt and J. H. Schelleng.

The concepts presented in the article has been used as the basis for loop closers for several different cave survey programs. Since the article has been out of print for a long time and it is virtually impossible to find anywhere on the internet, I've scanned my copy and posted it here:

 
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