It features an exhaustive cross-reference system that will efficiently guide you to other categories of related interest. Skim through the index - you'll be amazed at the diversity of items people collect. The index will also help you think of things you might own that may be valuable. Try looking under related subjects. Our extensive cross-reference will usually guide you, but use your imagination.
Many collectibles are crossovers, i.e. they have collector appeal in more than one field.
For instance, an early 20th century calendar depicting bicyclists has appeal not only to paper collectors but also to bicycle enthusiasts. Everyone will appreciate your courtesy. Include your phone number as well. If you are selling, many would-be buyers are anxious to speak to you personally as soon as possible. They will often have specific questions to ask that can be best answered over the phone.