Identifiant pérenne de la notice : 192298100
Notice de type
Personne
Web, http://www.surveyofindia.gov.in/pages/view/11/77-surveyor-generals-of-india-since-independence,
(2016-03-31)
Web, https://en.wikipedia.org/wiki/James_Walker_%28Surveyor_General%29 (2016-04-22)