The National Speleological Society has published a book to celebrate their 75th Anniversary. According to their Facebook page, it was "Published in celebration of the NSS' 75th Anniversary, "Diamond Jubilee of the National Speleological Society" is a hardbound, 291 page, historical book covering highlights from our past 75 years. The publication includes sections on national, regional, and grotto events, in addition to extensive chapters on science and technology."