This is another interesting article about using Least Squares to close cave survey loops.  It was titled "Simultaneous Multiple Loop Closures For Cave Surveys: A Computer Program." It was written by Neil I Smith and originally appeared in the Proceedings of Australian Speleological Society in 1979. It was reprinted the NSS Computer Applications Section newsletter in December of 1982.

The article present concepts and the author claims that his techniques are superior to other such as those presented Schmidt and Schelleng. Since the Computer Application Section is no longer active and the article is virtually impossible to find anywhere on the internet, I've scanned my copy and posted it here:

Click here to link to a different revision of the article