http://reply.papertrans.cn/1/49/4811/4811-31.png
http://reply.papertrans.cn/1/49/4811/4811-32.png
http://reply.papertrans.cn/1/49/4811/4811-33.png
http://reply.papertrans.cn/1/49/4811/4811-34.png
Submitted on: 10 May 2019.
Revised on: 09 June 2019.
Accepted on: 10 July 2019.
___________________Cartographica---UNIV TORONTO PRESS INC
Submitted on: 26 August 2016.
Revised on: 02 December 2016.
Accepted on: 24 December 2016.
___________________Cartographica---UNIV TORONTO PRESS INC