National Speleological Society · Natl Speleological Society
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| On Rope | 978-0-9615093-2-3 (0-9615093-2-5) | 1987 | Bruce Smith |
| On Rope: North American Vertical Rope Techniques for Caving ... Rappellers | 978-1-879961-05-0 (1-879961-05-9) | 1997 | " |