Worcestershire schools in the county provide Sixth-form education including two in the city of Worcester. Several vocational colleges provide GCSE and A-level courses and adult education, such as South Worcestershire College, and an agricultural campus of Warwickshire College in Pershore. There is also the University of Worcester, which is located in the city itself and is home to the National Pollen and Aerobiology Research Unit and five other national research centres. The county town and only city is Worcester. The other major settlements, Kidderminster, Bromsgrove and Redditch are satellite towns of Birmingham. There are also several market towns: Malvern, Bewdley, Evesham,
Economics of English towns and trade in the Middle Ages during the period. The provincial towns also had a substantial number of trades by the end of the 13th century - a large town like Coventry, for example, contained over three hundred different specialist occupations, and a smaller town such as Durham could support some sixty different professions. The increasing wealth of the nobility and the church was reflected in the widespread building of cathedrals and other prestigious buildings in the larger towns, in turn making use of lead from English mines for roofing. Land transport remained much more expensive than river or sea transport during the period. Many towns