The geography of urban street mapping in Pennsylvania: recent cartographic history.

Analysis of copyrights registered between 1946 and 1977 for street maps of Pennsylvania's fourteen major urban cartographic markets reveals a hierarchy of cities related to population size, economic health, and tourism. Number and types of maps published relate in a complex way to size of place, as does the frequency with which new or revised maps are issued. The 1960s saw a marked transition to color reproduction. Competition has intensified, street maps have become a vehicle for advertising by local banks and other businesses, and map publishers are using toll-free telephone numbers as one means of reaching potential commercial customers. -from Author