Produced by a Canadian librarian. Date Codes for Maps . Some specific examples relating to dates by publishers. Useful when working with maps by various companies. Does not explain the way dates reflect the item being cataloged.
Relief contains alphabetic codes describing relief types.
Since some maps display several types of relief, one to four codes may be recorded. Enter codes in order of their importance to the map. A ratio representing the relationship between a specified distance on a map and the actual distance on the ground. Map scale is frequently expressed as a representative fraction and graphically as a bar scale. UTM Grid System, Universal Transverse Mercator .