This initial alphabetic notation is divided by a progressive numerical notation, of which the following is a sample:
| D | Social Science |
| 2-8 | General |
| 10-92 | Manners, Customs, etc. |
| 94-150 | Political Economy |
| 152-272 | Government and Politics |
| 274-354 | Law |
| 356-358 | Commerce, Finance |
| 400-424 | Communications |
| 426-484 | Education |
CHAPTER XVII
PRACTICAL APPLICATION
241. Numbers.
241. Numbers.—The class letters and numbers of all books should be written in the inside, preferably on the back or front of the title-page, and should also be carried on to the labels, book-cards and all other records. On the outside the class letters and numbers may be lettered in gilt or written on a suitable tag, which must be firmly pasted on the back. The usual position for the tag is at about 11⁄2 inches from the foot of the back, as this gives regular and uniform marking, which looks neat. Some librarians prefer a place at the top of the back, as the arranging number thus becomes more prominent, and the tag at the foot is more subject to handling. The [diagram] shows the two methods.
Fig. 73.—Lettering of Class Numbers ([Section 241]).