The descriptions of individual editions in this catalogue utilise the following key fields, the presence and relative importance of which vary across respective entries:

• general information
• edition / impression code
• title-page transcription
• contents
• dedication
• deposit notice
• half-title (HT)
• headline (HL)
• caption title (CT)
• sub-caption (SC)
• footline (FL)
• comments
• modifications
• errors
• distinguishing musical feature(s) (DMF)
• additional distinguishing feature(s) (ADF)
• copies.

Each of these fields is discussed in the respective section.