Influence machines http://smg.koha-ptfs.co.uk//cgi-bin/koha/opac-shelves.pl?rss=1&viewshelf=331 RSS feed for public list Influence machines Electrical influence machines. / by Gray, John, http://smg.koha-ptfs.co.uk//cgi-bin/koha/opac-detail.pl?biblionumber=146600 Static electricity : by Wimshurst, James, http://smg.koha-ptfs.co.uk//cgi-bin/koha/opac-detail.pl?biblionumber=44384