A scrapbook created by Roger Johnson, son of Clifton Johnson, which contains newspaper articles, correspondence, pamphlets, and other ephemera relating to the subterranean explorations of Roger and others throughout the world.
Roger Johnson was an avid caver and in the 1930s coined the term 'spelunker' to describe those who have an interest in exploring caves yet are not professional speleologists. In 1949, G & C Merriam included the word for the first time in their unabridged dictionary.