----------------------------Original message---------------------------- This is my first posting to the list. I trust from my week of lurking observation that map cataloging questions are appropriate here. I am cataloging some navigational charts of Texas coastal waters produced by the U.S. Coast Survey in the 1850's. The LC examples I have seen don't include DDC numbers, and I am curious what the correct number for such charts would be. From a note in the DDC 20 Manual (T1-0223 vs. 912) I see that maps emphasizing a particular subject (e.g. railroad maps) are classed with that subject. Does this pertain also to navigational charts, and if so, with what subject do I class them? 623.89-something? Thanks in advance for your aid to this first-timer. Chuck Bearden Catalog Dept. Houston Public Library [log in to unmask]