Submitted on: 13 July 2011.
Revised on: 19 September 2011.
Accepted on: 07 October 2011.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC
Submitted on: 24 September 1998.
Revised on: 30 October 1998.
Accepted on: 09 December 1998.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC
Submitted on: 10 November 2016.
Revised on: 17 February 2017.
Accepted on: 24 March 2017.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC
http://reply.papertrans.cn/2/106/10571/10571-14.png
Submitted on: 19 November 1998.
Revised on: 07 January 1999.
Accepted on: 09 February 1999.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC
http://reply.papertrans.cn/2/106/10571/10571-16.png
http://reply.papertrans.cn/2/106/10571/10571-17.png
Submitted on: 11 January 2018.
Revised on: 02 April 2018.
Accepted on: 12 May 2018.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC
http://reply.papertrans.cn/2/106/10571/10571-19.png
Submitted on: 04 December 2004.
Revised on: 01 April 2005.
Accepted on: 04 May 2005.
___________________Geograficando---UNIV NAC LA PLATA, FAC HUMANIDADES & CIENCIAS EDUC