Stamps sent by a dealer to a collector for examination. Approvals must either be bought or returned to the dealer within a specified time.
Books sent automatically by a vendor that fit an established pre-set list of Library criteria; will not have to be ordered individually by title
These are stamps mailed by dealers to collectors for free examination. The collector selects and pays for, only those items he wishes to keep and sends the remainder back to the dealer.
Priced selections of stamps or covers sent to collectors by mail. The collector purchases the items he chooses, returning the rest to the approval dealer with payment for the purchased items.
Stamps sent to customers by dealers for purchase or return after examination. (Mystic thinks this is one of the easiest, most convenient ways to build a fine collection.)