Question about Pierce Atlas (is there anything else?)

[David Boyce]

"So my question is whether there are any other sources out there with 
information that one cannot find in Pierce?  (How did he do it?)"

Well, there is the UK-published "Musicians Piano Atlas" and its two 
Supplements, which has very good information for English pianos past and 
present, and European and far-eastern. They have a kind of agreement with 
Pierce not to tread too far into the US territory of Pierce..

But I don't think that's what youre after.  I don't think there's any other 
*published* resource for American pianos. No doubt there must be old 
catalogues and brochures and advertising material still hanging around in 
attics etc, but no-one has equalled or rivalled Pierce in collating such 
information.  You could always make it your life's work.......

Best,

David.