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!