The following are some excellent references on cave surveying and are available
through the NSS Bookstore or Speleobooks.
"Basic Underwater Cave Surveying", John Burge, 1988, National Speleological Society Cave Diving Section, Library of Congress 87-73433.
"On Station", George R. Dasher", 1994, National Speleological Society, Inc, Library of Congress 92-84074.
"The Art of Cave Mapping", Robert L. Taylor, Kenneth C. Thomson, Missouri Speleology, Volume 31, Numbers 1-4.