The Royal Dutch Society for Earth Sciences (KNGMG) published a PDF-version of its 'Geological Nomenclature' by Visser in 1980. The first edition of this nomenclature dates from 1929. The nomenclature was a great success and contained about 4000 terms. The main language was Dutch with a translation into English, French and German. In 1959, the second edition was published with the main reason that many new terms and geological insights were introduced in the intervening period. The main language was changed to English with a translation into Dutch, French and German. The number of terms increased to 5500. In 1980 the third edition was published. The main language was not changed, but a translation into Spanish was added. The number of terms increased to over 10,000.