245488
Discovery The existence of this road was unknown until 1949 when the archaeological division of the Ordnance Survey , while examining aerial photographs of the Milland area , noticed earthworks the size and shape of a Roman mansio , similar to those on Stane Street at Hardham and Alfoldean .
 organization: Ordnance Survey; location: Milland
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ordnance Survey, Milland 
Answer:
 organization: Ordnance Survey; location: Milland