1761
Much later in the Roman period , Pliny the Elder produced a very extensive discussion of many more minerals and metals then widely used for practical ends .
 person: Pliny the Elder
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Pliny the Elder