Further to the previous suggestions and identifications, tunes #2 and
#9 are almost certainly played on Hans Kruse's 70-keyless Wellershaus
organ and were included on an LP of that organ.

Tune #5 is 'En boheme', possibly played on a model 36 Ruth.

Tunes #7, #15, #20, and #24 are the 112-keyless Carl Frei organ in the
Thursford collection.

Tunes #11, #22, #25, #28, #29, and #31 are the 84-keyless Wellershaus,
also at Thursford.

It has been suggested that #3 is the Voigt organ (heard in Roller
Coaster Tycoon) that was formerly at Bressingham Gardens.  I do not
believe this to be the case, and the arrangement is quite different
to the version of "Bummel Petrus" as played on that organ.  Tune #3
sounds as if it might be played on a model 37 Ruth organ.

Regards,
Douglas Bush
UK