Authorized reproduction of the entire Singer class 24, models 31 to 34 and 36 to 39 parts catalog for sewing machines. The parts lists are sorted three ways and it has prices that were current when this book was published in 1915. It contains a complete list of parts in numerical order with basic descriptions of them. The same information is repeated but in alphabetical order by parts description. And, scaled illustrations of the parts are in it, too. This is a difficult to find parts book containing about 275 pages.