Go Reflect Field Name returning unwanted extra info

I have been trying to use the Reflect package to determine the names of the fields in a struct using this method:

func main() {
    book := Book{}
    e := reflect.ValueOf(&book).Elem()

    for i := 0; i < e.NumField(); i++ {
        varName := e.Type().Field(i).Name
        varType := e.Type().Field(i).Type
        varValue := e.Field(i).Interface()
        fmt.Printf("%v %v %v\n", varName,varType,varValue)
    }
  }

according to every example and tutorial I can find. I even found the 'structs' package which exposes a simple struct.Names method which achieves the same result, however all my field names come back like

'ID   invalid false' 

instead of just

'ID'

I can't find any mention of this anywhere. Thanks for any help.