This document discusses inquiry letters and provides examples. It defines inquiry letters as letters written by potential buyers to request information from sellers, such as price lists, catalogs, samples or terms of sale. The document notes that inquiries can be unsolicited, initiated by the buyer, or solicited in response to seller advertising. Effective inquiry letters are straightforward, courteous, positive, brief, complete and correct. The document provides examples of an unsolicited inquiry letter requesting a catalog and price list, and the seller's response providing the requested information and encouraging a trial order.