She included a screenshot:
My Answer
It would be very unusual for a book to not have an explanation of the abbreviations and terms used in the book. It is usually found at the front of the book. So in this case, you should scroll back to the start of the city directory and look for that explanation.
It is always a good idea to check out explanations or details that are provided at the start (preface or introduction) or end of any set of records. Don't overlook doing a little bit of reading to help you understand what you are looking at - the time frame, the location, abbreviations, a glossary or more might be included.
