http://nla.gov.au/nla.mus-an6304057
http://store.musicbasics.com/beyerferdinand.html
_ Lautaro Maciel Leiva - Ferdinand Beyer
http://jp.youtube.com/watch?v=0FR9zu8GsSM
_ Ferdinand Beyer - no.103
http://jp.youtube.com/watch?v=-o1gfRHW7aA
_ Beyer No. 81
http://jp.youtube.com/watch?v=u5oaGubtaEE
