Deltiology 101: A guide to Grading Postcards

Here is a link to a guide for grading postcards.  It is quite extensive and discusses term as like album marks, pioneers, and silvering.   For example - did you know there are SIX grades of conditions of postcards, from Mint (perfect, like it was just printed)  to Poor (incomplete card)?  If you are purchasing cards over the internet, this will be a helpful guideline to decide if the card is right for your needs - or if the description isn't adequate, it will help you ask the right questions so that you know exactly what you are getting.   It is also quite useful for someone who is getting into serious collecting.