From: Grootfontein
This Prisoner of War record for Johannes Petrus Jacobus Van Baalen was transcribed record from various documents held at the National Archives, South Africa, including arrest and shipping information from newspaper sources like De Zuid-Afrikaan.
https://www.gendatabase.com/boer-war-prisoner-record.php?q=12859&r=Johannes Petrus Jacobus&s=Van Baalen&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.