National Geographic Magazine 1954-03, March
National Geographic Magazine 1963-07, July
National Geographic Magazine 1959-11, November
National Geographic Magazine 1966-11, November
National Geographic Magazine 1958-01, January
National Geographic Magazine 1961-01, January
National Geographic Magazine 1964-04, April
National Geographic Magazine 1957-01, January
National Geographic Magazine 1963-04, April
National Geographic Magazine 1953-04, April
National Geographic – January 2015
National Geographic Magazine 1957-07, July
National Geographic Magazine 1964-09, September
National Geographic Magazine 1967-11, November
National Geographic Magazine 1962-07, July
National Geographic Magazine 1957-05, May
National Geographic Magazine 1954-05, May
National Geographic Magazine 1960-05, May
National Geographic Magazine 1958-10, October
National Geographic Magazine 1962-03, March
National Geographic Magazine 1958-08, August
National Geographic Magazine 1966-04, April
National Geographic Magazine 1954-11, November
National Geographic Magazine 1970-09, September
National Geographic Magazine 1957-04, April
Geography and You – November-December 2014
National Geographic Magazine 1958-04, April
National Geographic Colombia – Noviembre 2014
National Geographic Magazine 1966-09, September
National Geographic Magazine 1950-04, April
National Geographic Magazine 1954-07, July
National Geographic Magazine 1953-09, September
National Geographic Magazine 1951-10, October
National Geographic Magazine 1968-08, August
National Geographic Magazine 1967-03, March
National Geographic Magazine 1963-10, October
National Geographic Magazine 1966-12, December
National Geographic Magazine 1958-06, June
National Geographic Magazine 1965-03, March
National Geographic Magazine 1961-04, April
