The variation is usually depicted using shading or differences in color to represent variation in the value of the data being presented. Statistical maps are a type of thematic map.
This statistical map shows the percentage of children less than 72 months of age tested for lead in the blood by county. The percentage ranges are represented by different colors.
There are three types of card catalogue.
ReplyDeleteClassified catalogue, author catalogue, and title catalogue. Use the classified catalogue when you do not know the author or the title of a book, or when you want to search about a specific subject thoroughly