87155
Singer developed the milling industry in Bjelovar , but was also active in the development of coal mining , gravel extraction from the river Drava and its shipment to the big cities , and has also extracted gold from Drava .
 Bjelovar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bjelovar