
Bar codes are increasingly present in everyday life. The United States Postal Service (USPS) has developed a bar code, POSTNET, to represent the numbers of an address's ZIP code. Mail with these bar codes receive reduced postal rates as well as faster and more acurate delivery. County Cooperative Extension offices generate a massive amount of third-class bulk mail. Pennsylvania Extension has developed
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 0 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
