There are extensive listings in the book "Spoor en Post". (No pricing though.) They are also listed in "Benelux Revenues" by Barefoot. (Not as complete, but has values.) Finally, there is also an online listing at: http://members.casema.nl/leobakx/ There are hundreds of types.
Thank you for the reply...i will check the link..i have much Netherlands "back of book" material but rarely see railway stamps !
