Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Pyu Ancient Cities' has mentioned 'Iron' in the following places:
Occurrence Sentence Text Source
The establishment of literate Buddhist monastic communities arose in tandem with the re-organization of agricultural production, based on expert management of seasonally-scarce water resources and the specialized production of manufactured goods in terracotta, iron, gold, silver and semi-precious stones both for veneration and for trade.
Criterion (iv): Technological innovations in resource management, agriculture and manufacturing of brick and iron at the Pyu Ancient Cities created the preconditions leading to significant advances in urban planning and building construction.