Thanks, Murray. Did you make any tapes of your harmonium playing?
A year ago, when I first started to find info on the web about harmoniums, one of the first sites that came up in a search has a very nice description of the taxonomy of free reed instruments.

http://shift.merriweb.com.au/harmonium/types.html

I was looking for a lap harmonium (hand blown, made in India) and it took some searching until I finally tracked it down. The chart shown on the URL page above is very interesting in showing the family of instruments, whether they are mouth blown (harmonica), hand blown (concertina, accordian, lap harmonium), or foot-power blown (harmonium, American organ).
My son is practicing to see how fast he can play Bus Stop and The Rights of Man, because he wants to take posession of the harmonium when it arrives! We'll see how fast the key action is. It will take some co-ordination practice to pump with the left hand and play with the right.
alice