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15 January 2020
25 December 2019
4 November 2015
31 October 2015
8 April 2015
15 October 2013
→Silica emissions
-1,164
→History
+370
→Wisconsin and frac sand
-370
no edit summary
-344
→History
-13
no edit summary
+464
→Regulations: update
+1,533
26 February 2013
29 August 2012
25 July 2012
4 July 2012
5 June 2012
SW: add ref
+372
SW: →Citizen activism: - add section
+1,307
SW: →Companies: - add ref
+9
SW: →Companies: - add ref
+8
SW: →Companies: - add ref
+28
SW: →Industry groups: - add internal link
+34
SW: →Regulations: - add section
+217
15 May 2012
SW: add section
+81
SW: fix grammar
+2
SW: add section
+637
SW: add section
+10
SW: →Environmental and health issues: - fix grammar
-8
SW: add section
+1,267
SW: →Introduction: - add section
+456
