Mr. van der Pas is president of the Volcanic Caves Commission of the UIS, editor of the Speleophilately International magazine and SpeleoPhilately.com. An active speleologist, Mr. van der Pas is taking a part in the areas of exploring caves all around the world.

Articles

Caves and Arches on the Faroe Islands. 2005. 73:16-17.
Caves and stamps. Jules Verne an the ‘Journey to the Center of the Earth’. 1981. 1: 2-3.
Underground Limburg as seen by a speleophilatelist. 1983. 10: 7-9.
Are cave related stamps Expensive? 1983. 10: 14.
Fairy cave - Belgium. A visit to the ‘Trou des Fées’. 1983. 13: 18.
Speleophilatey and its History. 15: 1984. 13-15.
Just to give a thought to the matter of ”cave related” stamps. 1984. 18: 25.
The human aspect. 1986. 24: 17-28.
Some examples of pages from exhibition collections. 1988. 30: 6-8.
A visit to the Dyrholaey Natural Arch. 1988. 30: 9
Temporary list of W. - German Postal Items (Bildpostkarten). 1988. 30. 14-15.
A (disappointing) visit to the Caves of Meschers. 1988. 31: 8.
The Seven Sleepers cave. 1990. 34: 17.
Some information about the Öraefajoköll glacier area. 1991. 35: 11-12.
A visit to... the Music Cave. 1994. 42: 18.
Romanesti Cave Concerts. 1994. 42: 18-20.
Some thoughts and considerations about FDC’s (first-day-cover) and Max. Cards. 1994. 42: 27.
PRC China Postmarks and Cancellations. 1994. 43: 16-18.
More about Spanish local tax stamps issued 1936-1939. 1995. 48: 13-14.
A visit to Hvítserkur Natural Arch. Hurry... 1995. 48: 21.
Caves on Nordic Issue Faroer (3 June 1991, 650 Oyru). 1995. 48: 21.
Jugoslavia / Bosnia cancellations issued between 1988-1992. 1995. 48: 23-26.
The State of Oman stamp with “cave interior” not cave related. 1996. 49: 21.
Planes with the name “Vampire”. 1996. 50: 8.
Interesting Australian Card. 1996. 50: 24.