www.holdenconcertinas.com - maker (traditional concertinas)
wolvertonconcertinas.com - maker (traditional concertinas)
edwardjay.net - maker (3d printed concertinas)
martinwhiteblog.wordpress.com - maker (mandolins)
hmi.homewood.net/twitterzephyr - Bob's photo essay
www.concertina.net - forum and info
cohenbk.com - player
www.thedronenewstrad.com - news coverage of sorts!