presentacion powerpoint 1

http://www.slideshare.net/arcantos07/historia-del-ferrocarril-de-antioquia?qid=adf42ccd-3ced-4f69-b3e5-62a3a68347bb&v=qf1&b=&from_search=4

 

http://www.slideshare.net/deliamorales906/historia-del-ferrocarril-en-mxico-15535598?qid=f5ea5406-d577-4372-92dc-900c883bf74b&v=qf1&b=&from_search=6

 

http://www.slideshare.net/anapaulinamerceri/merceri-historia-del-ferrocarril-en-argentina?qid=2ef15e02-8218-433a-b7aa-a0daf29b9aec&v=qf1&b=&from_search=7

 

http://www.slideshare.net/DanielBenitez7/historia-del-ferrocarril-en-paraguay?qid=2ef15e02-8218-433a-b7aa-a0daf29b9aec&v=qf1&b=&from_search=5

 

http://www.slideshare.net/Israv_04/ferrocarril-10407431?qid=e319f8da-af16-4e74-ae95-854738f55060&v=qf1&b=&from_search=12

 

http://www.slideshare.net/cathepame/el-ferrocarril-21132020?qid=e319f8da-af16-4e74-ae95-854738f55060&v=default&b=&from_search=52