Compiled genealogies and other reference materials used in family history research (particularly directories and abstracts from records) often contain abbreviations, special symbols, formatting styles, etc. that can be confusing. These short hand approaches to writing are often done to save space on the printed page and make the compilation easier for the compiler.
They may be confusing to the person using the book if they don’t take the time to figure out what abbreviations, annotations, etc. mean. These are often explained in the introductory material in the publication. Copy or make digital images of these pages when you have the item. It will save time and frustration. This is a particularly good idea with city directories that often abbreviate words distinguishing between home owner, renter, boarder, etc.
Get the Genealogy Tip of the Day book. Great for reading cover to cover, browsing, taking notes in, or reading at random to get your research started.