Should each item in the appendices have a title, or is a number/letter designation sufficient?

To avoid confusion, each appendix or attachment is given both a number or letter designation and a title. References from the body of the text should include both number or letter designation and the title:

See Appendix A (Nomenclature of Breeds) for complete

information on the designation of breed categories.

The computational procedure is described in Appendix 1,

How to Compute a Group Average.